CN109672171B - Automatic control strategy for eliminating 500kV transformer overload - Google Patents
Automatic control strategy for eliminating 500kV transformer overload Download PDFInfo
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Abstract
The invention relates to an automatic control strategy for eliminating 500kV transformer overload, which comprises the following steps: examining all running equipment of a 220kV power supply partition where the transformer is located and executing a corresponding control strategy; examining all operating stations of a 220kV power supply partition where the transformer is located and executing corresponding control strategies; sequentially checking the standby state buses in the 220kV power supply subarea where the transformer is located and executing a corresponding control strategy: checking all operating stations of the 220kV power supply partition where the transformer is located and executing corresponding control strategies: and performing load flow calculation and short-circuit current check on all the strategies again, and executing corresponding control strategies according to all the check results: auxiliary information of "notification of relevant pull-up limit Δ L MW" is output. The method can quickly, automatically and accurately generate the auxiliary strategy information for eliminating the 500kV transformer overload, the strategy information can flexibly adapt to the change of the topological structure or the operation mode of the power grid, and the overload faults of various 500kV transformers can be flexibly dealt with and processed without the need of later maintenance and updating of related strategies.
Description
Technical Field
The invention belongs to the technical field of power grid automation, and particularly relates to an automatic control strategy for eliminating 500kV transformer overload.
Background
When the 500kV transformer is overloaded, a dispatcher should timely take relevant operations to increase the output of a unit in a power supply subarea or transfer the load in the power supply subarea, otherwise, the transformer is damaged, other transformers or circuits in the power supply subarea are further overloaded, and the accident influence is enlarged.
At present, the dispatching personnel still need to manually order the operation according to abundant operation experience when handling the 500kV transformer overload fault, the automation and intelligence levels are low, most expert systems establish inherent strategies and are difficult to adapt to the change of a tracking power grid mode, and therefore no related system or application really provides a flexible strategy for adjusting the mode. Therefore, there is a need to develop an automatic decision-making method for quickly eliminating the overload of the 500kV transformer, so as to timely reduce or eliminate the damage to the equipment and the power grid caused by the overload, improve the automation and intelligence level of the work of the dispatching personnel, and further improve the capability of controlling the operation of the power grid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic control strategy for eliminating 500kV transformer overload, and auxiliary strategy information for eliminating 500kV transformer overload can be quickly, automatically and accurately generated.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
an automatic control strategy for eliminating 500kV transformer overload comprises the following steps:
step 1, examining transformer TiCalculating all running equipment of the 220kV power supply subarea in which each 220kV generator set G is arranged1…GnUpper spare M ofiReading the results of the sensitivity calculation module about the above-mentioned each set pair of the mitigation transformers TiSensitivity to overload Ki(ii) a And executing a corresponding control strategy;
step 2, examining the transformer TiAll the operating stations in the 220kV power supply subarea, if partial 220kV stations S exist1,…SnAnd simultaneously belonging to other 220kV power supply subareas, and sequentially connecting the transformer substations S1,…SnCarrying out treatment; examination of 220kV transformer substation SiReal-time topology in the station and corresponding control strategies are executed;
step 3, examining the transformer T in sequenceiStandby state bus B in 220kV power supply partition1,…Bn(ii) a If the bus BiIf the buses of the opposite-end transformer substation connected with one or more empty charging lines belong to another power supply subarea, the bus B is considerediAdjusting the mode, starting a short-circuit current and load flow calculation module, and checking a bus BiAnd the switch-in mode of the hot standby side of the last one or more empty charging lines is carried out, and a corresponding control strategy is executed:
step 4, examining the transformer TiAll the operating stations of the 220kV power supply subarea are located, if some 500kV transformer substations S exist in the operating stations1,…SnMeanwhile, the method also belongs to other power supply subareas, and the 500kV transformer substation S is examined in sequenceiReal-time topology in the station: if TiBus B in a zone running state1,…BnIf one or more bus-coupled/sectionalized switches in the hot standby state are arranged between the bus-coupled/sectionalized switches and buses in other partition operation states in the station, a load flow calculation module is started, the mode that the bus-coupled/sectionalized switches in the hot standby states are all combined is checked, and corresponding control is executedAnd (3) strategy preparation:
step 5, adjusting the strategy in the temporary storage mode in the step 3 and the step 4, performing load flow calculation and short-circuit current check again, and executing a corresponding control strategy according to all the check results:
and 6, outputting auxiliary information for informing relevant pull-up circuit limit voltage delta LMW.
Further, the control strategy of step 1 is:
first working
And a transformer TiWhen the overload is less than 10%, G is output1,…GnThe auxiliary information of the unit output fullness is obtained, and the control strategy is ended;
the medicine is used
Or transformer TiWhen the overload is more than 10%, G is output1,…GnAnd (5) the output of the unit is fully expanded, and the auxiliary information is transferred to the step 2-6 for continuous processing.
Further, the control strategy of step 2 is:
first, a if transformer TiBus B in running state in 220kV power supply partition1,…BnIf bus-coupled/sectionalized switches in hot standby state are arranged between the bus-coupled/sectionalized switches and buses in other partition operation states in the station, a load flow calculation module is started to check that all the bus-coupled/sectionalized switches in the hot standby state are integrated and the bus-coupled/sectionalized switches in the hot standby state are the bus-coupled/sectionalized switches in the hot standby state1,…BnThe upper power circuit switches are all pulled open;
a transformer T is providediTransformer T in running state in 220kV power supply subareakIf there is a bus-tie/sectionalizer in hot standby state between the bus of low voltage slave and the buses of transformer in running state belonging to other subareas and between the buses of low voltage slave, then a load flow calculation module is started to check the combination of the bus-tie/sectionalizer in hot standby state, and the transformer TkThe medium and low voltage is subjected to the main switch and is pulled open;
the calculation result of the adjustment in the manner of the first and second aspects is provided with:
adding overload equipment in the whole network, abandoning the mode adjustment, and turning to S1,…SnContinuing calculation processing of the next transformer substation in the set; if S is present1,…SnWhen the calculation processing of all the transformer substations is finished, the step 3-6 is carried out to continue the calculation processing;
② no overload equipment is added in the whole network, and TiIf the overload is eliminated, outputting the auxiliary information adjusted in the mode;
③ no overload equipment newly added in the whole network, TiIf overload is not eliminated, outputting the auxiliary information regulated in the above mode and updating TiAn overload amount DeltaL, and based on the mode, turning to S1,…SnContinuing to calculate and process the next transformer substation in the set if S1,…SnAnd (5) after the calculation processing of all the transformer substations is finished, the step 3-6 is carried out to continue the calculation processing.
Further, the control strategy of step 3 is:
if the whole network is newly added with overload equipment or TiIf overload is increased, the mode adjustment is abandoned and the T is turnediContinuing to analyze and process the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing;
the full network has no newly-increased overload equipment and no newly-increased short-circuit current standard-exceeding bus, and TiIf the overload is eliminated, outputting the auxiliary information adjusted by the mode;
the fact that if the whole network is not provided with newly-increased overload equipment and newly-increased short-circuit current over-standard bus, TiIf the excess load is still not eliminated, the mode adjustment strategy and T are temporarily storediOverload and go to TiContinuing to analyze and process the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing;
fourth, if the whole network is not provided with newly-increased overload devices, but newly-increased short-circuit current exceeds the standard bus, the whole network is started againThe dynamic short-circuit current and load flow calculation module checks the disconnected bus B on the basis of the previous mode adjustmentiGo up all looped netowrk line switch, include:
firstly, when the calculation result has no new overload equipment and no new over-standard short-circuit current bus, and TiIf the overload is eliminated, outputting the mode adjustment information;
secondly, when the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiIf the overload is reduced but not eliminated, outputting the auxiliary information adjusted in the manner to update TiOverload amount DeltaL, and go to TiContinuing to analyze and process the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing;
thirdly, when the calculation result has new overload equipment, over-standard short-circuit current bus or TiWhen overload is increased, abandon the mode adjustment and turn to TiAnd (4) continuing analyzing and processing the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing.
Further, the control strategy of step 4 is:
if the whole network is newly added with overload equipment or TiIf the overload is increased, the mode adjustment is abandoned and the S is switched to1,…SnThe next 500kV transformer substation continues to analyze and process, if S is the same time1,…SnWhen the 500kV transformer substations in the transformer substation are all calculated, the step 5-6 is carried out to continue the calculation;
the full network has no newly-increased overload equipment and no newly-increased short-circuit current standard-exceeding bus, and TiIf the overload is eliminated, outputting the auxiliary information adjusted by the mode;
the fact that if the whole network is not provided with newly-increased overload equipment and newly-increased short-circuit current over-standard bus, TiIf the excess load is still not eliminated, the mode adjustment strategy and T are temporarily storediOverload amount, and go to S1,…SnThe next 500kV transformer substation continues to analyze and process, if S is the same time1,…SnWhen the 500kV transformer substations in the transformer substation are all calculated, the step 5-6 is carried out to continue the calculation;
fourthly, if the whole network is not provided with newly-increased overload devices but with newly-increased short-circuit current exceeding-standard buses, the 500kV transformer substation S is examined againiNon-bus B in station1,…Bn220kV bus Bn+1,…Bm(ii) a Bus Bn+1,…BmBelonging to another partition { Tk,…TpFrom the set { T }k,…TpRemoving the waste heat from the bus Bn+1,…BmAfter the 500kV is subjected to linkage transformation, a new set { T is formedr,…Tp}; slave bus Bn+1,…BmStarting from the line, searching 220kV buses in each substation station at the opposite end along the real-time topology, and if some buses B existk,…BjMarked as running at { Tr,…TpAnd if any 500kV is subjected to the linkage change, the short-circuit current and power flow calculation module is started again, and the disconnected bus B is checked on the basis of the previous mode adjustmentn+1,…BmIs connected to the bus Bk,…BjThe line switch of (1), comprising:
firstly, when the calculation result has no new overload equipment and no new over-standard short-circuit current bus, and TiIf the overload is eliminated, outputting the mode adjustment information;
secondly, when the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiIf the overload is reduced but not eliminated, outputting the auxiliary information adjusted in the manner to update TiOverload amount DeltaL, and go to S1,…SnThe next 500kV transformer substation continues to analyze and process, if S is the same time1,…SnWhen the 500kV transformer substations in the transformer substation are all calculated, the step 5-6 is carried out to continue the calculation;
thirdly, when the calculation result has new overload equipment, over-standard short-circuit current bus or TiWhen overload is increased, abandon the mode adjustment, and go to S1,…SnThe next 500kV transformer substation in the system continues to analyze and process; if S is present1,…SnAll the 500kV transformer substations in the transformer substation are calculatedAnd after the processing is finished, the step 5-6 is carried out to continue the calculation processing.
Further, the control strategy of step 5 is:
the method has the advantages that if one or more strategies are adjusted in one mode, the checking result meets the condition that no overload equipment and no short-circuit current exceed-standard bus exist in the whole network, and the transformer T is used for preventing the transformer T from exceeding the standardiIf the overload is eliminated, outputting the auxiliary information adjusted by the modes;
if the results in the process do not exist, but one or more verification results of mode adjustment strategies exist, the condition that the whole network has no overload equipment and no short-circuit current exceeding-standard bus is met, and the transformer T has the advantages thatiIf the overload is not eliminated even though it is reduced, the transformer T is outputiAdjusting the information in such a way that the amount of overload is reduced the most, the program updates TiCarrying out overload amount delta L, and continuing to process in step 6;
and if the results in the first step and the second step do not exist, the step 6 is carried out to continue the processing.
The invention has the advantages and positive effects that:
1. the invention takes the real-time power grid topological structure as the basis, comprehensively considers various mode adjustment strategies, is not influenced by the power grid topological structure or the operation mode change, and combines the related application modules in the existing dispatching system to quickly, automatically and accurately generate the auxiliary strategy information for eliminating the 500kV transformer overload, the strategy information can flexibly adapt to the power grid topological structure or the operation mode change, and the overload faults of various 500kV transformers can be flexibly handled without the need of later maintenance and updating the related strategies.
2. In the logic algorithm design, the overload capacity is always quantized to ensure the accuracy of the calculation result, the feasibility of the adjustment of the mode is verified through the load flow calculation or the short-circuit current calculation module, and the order of the logic steps gives consideration to the principle of minimum adjustment of the power grid mode, so that the final strategy information provided by the method is more accurate and optimized.
Drawings
FIG. 1 is a flow chart of a control strategy of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
According to the invention, various mode adjustment strategies are comprehensively considered according to the real-time power grid topological structure, the influence of the power grid topological structure or the change of the operation mode is avoided, and the auxiliary strategy information for eliminating the 500kV transformer overload can be quickly, automatically and accurately generated by combining the related application modules in the existing dispatching system.
In this embodiment, a 500kV transformer T is assumediWhen the transformer is overloaded by delta L, the automatic control strategy for eliminating the overload of the 500kV transformer comprises the following steps:
step 1, examining transformer TiCalculating all running equipment of the 220kV power supply subarea in which each 220kV generator set G is arranged1…GnUpper spare M ofiReading the results of the sensitivity calculation module about the above-mentioned each set pair of the mitigation transformers TiSensitivity to overload Ki。
(1) When in use
And a transformer TiWhen the overload is less than 10%, the prompt G1,…GnThe auxiliary information that the output of the unit is full is obtained, and the program is exited;
(2) when in use
Or transformer TiIf the overload is more than 10%, the alarm will indicate G1,…GnAnd (4) auxiliary information of the full increase of the output of the unit, and continuing the calculation processing by the method of the following steps 2-6.
Step 2, examining the transformer TiAll the operating stations in the 220kV power supply subarea, if partial 220kV stations S exist1,…SnAnd simultaneously belonging to other 220kV power supply subareas, and sequentially connecting the transformer substations S1,…SnCarrying out treatment; examination of 220kV transformer substation Si(Si∈S1,…Sn) Real-time topology in the station:
(1) if TiMother of running state in 220kV power supply partitionLine B1,…BnIf bus-coupled/sectionalized switches in hot standby state are arranged between the bus-coupled/sectionalized switches and buses in other partition operation states in the station, a load flow calculation module is started to check that all the bus-coupled/sectionalized switches in the hot standby state are integrated and the bus-coupled/sectionalized switches in the hot standby state are the bus-coupled/sectionalized switches in the hot standby state1,…BnThe switches of the upper power circuit are all pulled open.
(2) If TiTransformer T in running state in 220kV power supply subareakIf there is a bus-tie/sectionalizer in hot standby state between the bus of low voltage slave and the buses of transformer in running state belonging to other subareas and the bus of low voltage slave, then the load flow calculation module is started to check the combination of the bus-tie/sectionalizer in hot standby state, and the transformer TkThe middle and low voltage is pulled open by the main switch.
The calculation results adjusted according to the above (1) and (2) are: a) the whole network has new overload equipment, abandons the mode adjustment and turns to S1,…SnThe next substation in the set continues the calculation process. If S is present1,…SnAnd (5) after the calculation processing of all the transformer substations is finished, the following steps 3-6 are carried out to continue the calculation processing. b) No newly-added overload equipment is arranged in the whole network, and TiAnd prompting the auxiliary information adjusted in the mode when the overload is eliminated. c) Full network without newly added overload devices, TiIf overload is not eliminated, the auxiliary information adjusted in the above mode is prompted, and T is updatediAn overload amount DeltaL, and based on the mode, turning to S1,…SnThe next substation in the set continues the calculation process. If S1,…SnAnd (5) after the calculation processing of all the transformer substations is finished, the following steps 3-6 are carried out to continue the calculation processing.
Step 3, examining the transformer T in sequenceiStandby state bus B in 220kV power supply partition1,…Bn. If the bus Bi(Bi∈B1…Bn) The buses of the opposite-end transformer substation connected with the empty charging line(s) on the transformer substation belong to another power supply subarea, and then the bus B is considerediAdjusting the mode, starting a short-circuit current and load flow calculation module, and checking a bus BiThe switching-in mode of the hot standby side switch of the overhead charging line(s) comprises the following calculation results:
(1) if the whole network has new overload equipment or TiIf overload is increased, the mode adjustment is abandoned and the T is turnediAnd analyzing and processing the next bus in the standby state in the partition. And if the calculation processing of the subarea standby bus is finished at the moment, the method goes to the following step 4-6 to continue the calculation processing.
(2) If the whole network has no overload equipment and no short-circuit current exceeding bus, and TiAnd prompting the auxiliary information adjusted by the mode when the overload is eliminated.
(3) If the whole network has no overload equipment and no short-circuit current exceeding bus, TiIf the excess load is still not eliminated, the mode adjustment strategy and T are temporarily storediOverload and go to TiAnd analyzing and processing the next bus in the standby state in the partition. And if the calculation processing of the subarea standby bus is finished at the moment, the method goes to the following step 4-6 to continue the calculation processing.
(4) If no overload equipment is newly added in the whole network but a newly added short-circuit current exceeding bus exists, the short-circuit current and power flow calculation module is started again at the moment, and the disconnected bus B is checked on the basis of the adjustment in the previous modeiGo up all looped netowrk line switches (do not contain power plant's line that is incorporated into the power networks): (a) when the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiAnd prompting the mode adjustment information when the overload is eliminated. (b) When the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiIf the overload is reduced but not eliminated, the auxiliary information adjusted by the method is prompted to update TiOverload amount DeltaL, and go to TiAnd analyzing and processing the next bus in the standby state in the partition. And if the calculation processing of the subarea standby bus is finished at the moment, the method goes to the following step 4-6 to continue the calculation processing. (c) When overload equipment, short-circuit current exceeding bus or T are newly added in the calculation resultiWhen overload is increased, abandon the mode adjustment and turn to TiAnd analyzing and processing the next bus in the standby state in the partition. If at this timeAnd (4) after the calculation processing of all the subarea standby buses is finished, the next step 4-6 is carried out to continue the calculation processing.
Step 4, examining the transformer TiAll the operating stations of the 220kV power supply subarea are located, if some 500kV transformer substations S exist in the operating stations1,…SnMeanwhile, the method also belongs to other power supply subareas, and the 500kV transformer substation S is examined in sequencei(Si∈S1,…Sn) Real-time topology in the station: if TiBus B in a zone running state1,…BnAnd if one or more bus tie/section switches in a hot standby state are arranged between the bus tie/section switches and buses in other partition operation states in the station, starting a load flow calculation module, checking the mode that the bus tie/section switches in the hot standby states are all combined, and according to the calculation result, the method comprises the following steps:
(1) if the whole network has new overload equipment or TiIf the overload is increased, the mode adjustment is abandoned and the S is switched to1,…SnAnd the next 500kV transformer substation in the process continues to analyze and process. If S is present1,…SnAnd when the 500kV transformer substations in the transformer substation are all calculated, the following step 5-6 is carried out to continue the calculation.
(2) If the whole network has no overload equipment and no short-circuit current exceeding bus, and TiAnd prompting the auxiliary information adjusted by the mode when the overload is eliminated.
(3) If the whole network has no overload equipment and no short-circuit current exceeding bus, TiIf the excess load is still not eliminated, the mode adjustment strategy and T are temporarily storediOverload amount, and go to S1,…SnAnd the next 500kV transformer substation in the process continues to analyze and process. If S is present1,…SnAnd when the 500kV transformer substations in the transformer substation are all calculated, the following step 5-6 is carried out to continue the calculation.
(4) If no overload equipment is newly added in the whole network but a newly-added short-circuit current exceeding bus is arranged, the 500kV transformer substation S is examined againiNon-bus B in station1,…Bn220kV bus Bn+1,…Bm. Bus Bn+1,…BmBelonging to another partition { Tk,…TpFrom the set { T }k,…TpRemoving the waste heat from the bus Bn+1,…BmAfter the 500kV is subjected to linkage transformation, a new set { T is formedr,…Tp}. Slave bus Bn+1,…BmStarting from the line, searching 220kV buses in each substation station at the opposite end along the real-time topology, and if some buses B existk,…BjMarked as running at { Tr,…TpAnd if any 500kV is subjected to the linkage change, the short-circuit current and power flow calculation module is started again, and the disconnected bus B is checked on the basis of the previous mode adjustmentn+1,…BmIs connected to the bus Bk,…BjThe line switch of (1): (a) when the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiAnd prompting the mode adjustment information when the overload is eliminated. (b) When the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiIf the overload is reduced but not eliminated, the auxiliary information adjusted by the method is prompted to update TiOverload amount DeltaL, and go to S1,…SnAnd the next 500kV transformer substation in the process continues to analyze and process. If S is present1,…SnAnd when the 500kV transformer substations in the transformer substation are all calculated, the following step 5-6 is carried out to continue the calculation. (c) When overload equipment, short-circuit current exceeding bus or T are newly added in the calculation resultiWhen overload is increased, abandon the mode adjustment, and go to S1,…SnAnd the next 500kV transformer substation in the process continues to analyze and process. If S is present1,…SnAnd when the 500kV transformer substations in the transformer substation are all calculated, the following step 5-6 is carried out to continue the calculation.
Step 5, adjusting the strategy in the temporary storage mode in the step 3-4, and performing load flow calculation and short-circuit current check again, wherein according to all the check results, the method comprises the following steps:
(1) if one or more mode adjustment strategies exist, the check result meets the requirements that the whole network has no overload equipment or short-circuit current exceeding bus, and the transformer TiAnd prompting auxiliary information adjusted in the modes when the overload is eliminated.
(2) If the result in the step (1) does not exist, the check result of one or more mode adjustment strategies meets the requirements that the whole network has no overload equipment or short-circuit current exceeding-standard bus, and the transformer TiIf the overload is not eliminated even though it is reduced, the transformer T is prompted to be enablediAdjusting the information in such a way that the amount of overload is reduced the most, the program updates TiThe loading amount deltaL is carried out, and the process is continued to the step 6.
(3) If there is no result in (1) or (2), the process proceeds to step 6 described below.
And 6, displaying auxiliary information of informing relevant pull-up circuit limit circuit delta L MW.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (6)
1. An automatic control strategy for eliminating 500kV transformer overload is characterized by comprising the following steps:
step 1, examining transformer TiCalculating all running equipment of the 220kV power supply subarea in which each 220kV generator set G is arranged1…GnUpper spare M ofiReading the results of the sensitivity calculation module about the above-mentioned each set pair of the mitigation transformers TiSensitivity to overload Ki(ii) a And executing a corresponding control strategy;
step 2, examining the transformer TiAll the operating stations in the 220kV power supply subarea, if partial 220kV stations S exist1,…SnAnd simultaneously belonging to other 220kV power supply subareas, and sequentially connecting the transformer substations S1,…SnCarrying out treatment; examination of 220kV transformer substation SiReal-time topology in the station and corresponding control strategies are executed;
step 3, examining the transformer T in sequenceiStandby state bus B in 220kV power supply partition1,…Bn(ii) a If the bus BiOnIf the buses of the opposite-end transformer substation connected with one or more empty charging lines belong to another power supply subarea, the bus B is considerediAdjusting the mode, starting a short-circuit current and load flow calculation module, and checking a bus BiAnd the switch-in mode of the hot standby side of the last one or more empty charging lines is carried out, and a corresponding control strategy is executed:
step 4, examining the transformer TiAll the operating stations of the 220kV power supply subarea are located, if some 500kV transformer substations S exist in the operating stations1,…SnMeanwhile, the method also belongs to other power supply subareas, and the 500kV transformer substation S is examined in sequenceiReal-time topology in the station: if TiBus B in a zone running state1,…BnAnd if one or more bus-coupled/sectional switches in a hot standby state are arranged between the bus-coupled/sectional switches and buses in other partition operation states in the station, starting a load flow calculation module, checking the mode that the bus-coupled/sectional switches in the hot standby states are all combined, and executing a corresponding control strategy:
step 5, adjusting the strategy in the temporary storage mode in the step 3 and the step 4, performing load flow calculation and short-circuit current check again, and executing a corresponding control strategy according to all the check results:
and 6, outputting auxiliary information for informing relevant pull-up circuit limit voltage delta LMW.
2. The automatic control strategy for eliminating 500kV transformer overload according to claim 1, wherein: the execution control strategy of the step 1 is as follows:
first working
And a transformer TiWhen the overload is less than 10%, G is output1,…GnThe auxiliary information of the unit output fullness is obtained, and the control strategy is ended;
the medicine is used
Or transformer TiOverloadIf it is greater than 10%, G is output1,…GnAuxiliary information of the full output of the unit is transmitted, and the step 2-6 is carried out for continuous processing;
m aboveiIs the upper reserve capacity, K, of the ith generator setiIs the sensitivity of the ith genset to mitigate transformer overload.
3. The automatic control strategy for eliminating 500kV transformer overload according to claim 1, wherein: the control strategy of the step 2 is as follows:
first, a if transformer TiBus B in running state in 220kV power supply partition1,…BnIf bus-coupled/sectionalized switches in hot standby state are arranged between the bus-coupled/sectionalized switches and buses in other partition operation states in the station, a load flow calculation module is started to check that all the bus-coupled/sectionalized switches in the hot standby state are integrated and the bus-coupled/sectionalized switches in the hot standby state are the bus-coupled/sectionalized switches in the hot standby state1,…BnThe upper power circuit switches are all pulled open;
a transformer T is providediTransformer T in running state in 220kV power supply subareakIf there is a bus-tie/sectionalizer in hot standby state between the bus of low voltage slave and the buses of transformer in running state belonging to other subareas and between the buses of low voltage slave, then a load flow calculation module is started to check the combination of the bus-tie/sectionalizer in hot standby state, and the transformer TkThe medium and low voltage is subjected to the main switch and is pulled open;
the calculation result of the adjustment in the manner of the first and second aspects is provided with:
adding overload equipment in the whole network, abandoning the mode adjustment, and turning to S1,…SnContinuing calculation processing of the next transformer substation in the set; if S is present1,…SnWhen the calculation processing of all the transformer substations is finished, the step 3-6 is carried out to continue the calculation processing;
② no overload equipment is added in the whole network, and TiIf the overload is eliminated, outputting the auxiliary information adjusted in the mode;
③ no overload equipment newly added in the whole network, TiIf the overload is not eliminated, outputting the mode adjustmentComplete auxiliary information, update TiAn overload amount DeltaL, and based on the mode, turning to S1,…SnContinuing to calculate and process the next transformer substation in the set if S1,…SnAnd (5) after the calculation processing of all the transformer substations is finished, the step 3-6 is carried out to continue the calculation processing.
4. The automatic control strategy for eliminating 500kV transformer overload according to claim 1, wherein: the control strategy of the step 3 is as follows:
if the whole network is newly added with overload equipment or TiIf overload is increased, the mode adjustment is abandoned and the T is turnediContinuing to analyze and process the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing;
the full network has no newly-increased overload equipment and no newly-increased short-circuit current standard-exceeding bus, and TiIf the overload is eliminated, outputting the auxiliary information adjusted by the mode;
the fact that if the whole network is not provided with newly-increased overload equipment and newly-increased short-circuit current over-standard bus, TiIf the excess load is still not eliminated, the mode adjustment strategy and T are temporarily storediOverload and go to TiContinuing to analyze and process the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing;
fourth, if the whole network is not provided with the newly-added overload devices but is provided with newly-added buses with the short-circuit current exceeding the standard, the short-circuit current and power flow calculation module is started again, and the disconnected buses B are checked on the basis of the adjustment in the previous modeiGo up all looped netowrk line switch, include:
firstly, when the calculation result has no new overload equipment and no new over-standard short-circuit current bus, and TiIf the overload is eliminated, outputting the mode adjustment information;
secondly, when the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiIf the overload is reduced but not eliminated, outputting the auxiliary information adjusted by the method, and furtherNew TiOverload amount DeltaL, and go to TiContinuing to analyze and process the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing;
thirdly, when the calculation result has new overload equipment, over-standard short-circuit current bus or TiWhen overload is increased, abandon the mode adjustment and turn to TiAnd (4) continuing analyzing and processing the next bus in the standby state in the partition, and if the calculation processing of the standby buses in the partition is finished at the moment, turning to the step 4-6 to continue the calculation processing.
5. The automatic control strategy for eliminating 500kV transformer overload according to claim 1, wherein: the control strategy of the step 4 is as follows:
if the whole network is newly added with overload equipment or TiIf the overload is increased, the mode adjustment is abandoned and the S is switched to1,…SnThe next 500kV transformer substation continues to analyze and process, if S is the same time1,…SnWhen the 500kV transformer substations in the transformer substation are all calculated, the step 5-6 is carried out to continue the calculation;
the full network has no newly-increased overload equipment and no newly-increased short-circuit current standard-exceeding bus, and TiIf the overload is eliminated, outputting the auxiliary information adjusted by the mode;
the fact that if the whole network is not provided with newly-increased overload equipment and newly-increased short-circuit current over-standard bus, TiIf the excess load is still not eliminated, the mode adjustment strategy and T are temporarily storediOverload amount, and go to S1,…SnThe next 500kV transformer substation continues to analyze and process, if S is the same time1,…SnWhen the 500kV transformer substations in the transformer substation are all calculated, the step 5-6 is carried out to continue the calculation;
fourthly, if the whole network is not provided with newly-increased overload devices but with newly-increased short-circuit current exceeding-standard buses, the 500kV transformer substation S is examined againiNon-bus B in station1,…Bn220kV bus Bn+1,…Bm(ii) a Bus Bn+1,…BmBelonging to another partition { Tk,…TpOfRunning the device from the set { T }k,…TpRemoving the waste heat from the bus Bn+1,…BmAfter the 500kV is subjected to linkage transformation, a new set { T is formedr,…Tp}; slave bus Bn+1,…BmStarting from the line, searching 220kV buses in each substation station at the opposite end along the real-time topology, and if some buses B existk,…BjMarked as running at { Tr,…TpAnd if any 500kV is subjected to the linkage change, the short-circuit current and power flow calculation module is started again, and the disconnected bus B is checked on the basis of the previous mode adjustmentn+1,…BmIs connected to the bus Bk,…BjThe line switch of (1), comprising:
firstly, when the calculation result has no new overload equipment and no new over-standard short-circuit current bus, and TiIf the overload is eliminated, outputting the mode adjustment information;
secondly, when the calculation result has no new overload equipment or short-circuit current exceeding bus, and TiIf the overload is reduced but not eliminated, outputting the auxiliary information adjusted in the manner to update TiOverload amount DeltaL, and go to S1,…SnThe next 500kV transformer substation continues to analyze and process, if S is the same time1,…SnWhen the 500kV transformer substations in the transformer substation are all calculated, the step 5-6 is carried out to continue the calculation;
thirdly, when the calculation result has new overload equipment, over-standard short-circuit current bus or TiWhen overload is increased, abandon the mode adjustment, and go to S1,…SnThe next 500kV transformer substation in the system continues to analyze and process; if S is present1,…SnAnd (5) after the 500kV transformer substations are all calculated, continuing to perform calculation processing in the step 5-6.
6. The automatic control strategy for eliminating 500kV transformer overload according to claim 1, wherein: the control strategy of the step 5 is as follows:
the method has the advantages that if one or more strategies are adjusted in one or more ways, the checking result meets the condition that no overload equipment and no short-circuit current exceed-standard bus exist in the whole networkAnd a transformer TiIf the overload is eliminated, outputting the auxiliary information adjusted by the modes;
if the results in the process do not exist, but one or more verification results of mode adjustment strategies exist, the condition that the whole network has no overload equipment and no short-circuit current exceeding-standard bus is met, and the transformer T has the advantages thatiIf the overload is not eliminated even though it is reduced, the transformer T is outputiAdjusting the information in such a way that the amount of overload is reduced the most, the program updates TiCarrying out overload amount delta L, and continuing to process in step 6;
and if the results in the first step and the second step do not exist, the step 6 is carried out to continue the processing.
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