CN103227468B - Main wiring pairing and stringing optimization method for transformer station - Google Patents
Main wiring pairing and stringing optimization method for transformer station Download PDFInfo
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Abstract
The invention discloses a main wiring pairing and stringing optimization method for a transformer station for a 3/2 main wiring mode commonly used by the transformer station. The operable pairing and stringing optimization method is provided from the point of effects of current pairing and stringing on power grid structure change and system operation safety and stability under the condition that one bus of the transformer station is overhauled and the other bus is tripped, and from a generating station output wire and a main transformer connection mode, effects of the pairing and the stringing on a power grid structure and a system flow, and the like by combining with a planning design of the transformer station. Therefore, potential safety and stability dangers to a power grid by the put-into-operation transformer station can be solved or reduced; a safe and stable operation level of an electric system can be raised; a technical method can be provided for the planning design of the transformer station and for review on the transformer station; and adverse effects of the unreasonable pairing and stringing on safe and stable operation of the electric system can be solved from the source.
Description
Technical field
The invention belongs to project of transmitting and converting electricity technical field, be specifically related to a kind of Substation Bus Arrangement and join string optimization method.
Background technology
Current, China's electric power system is with 500 kilovolts of level Grid for bulk transmission grid, and 500 kv substations status is in systems in which very important.The 500 kv substation main electrical scheme overwhelming majority of China adopt 3/2 mode of connection, single element fault (N-1 fault) occurs under normal mode to be affected little on electrical network basic structure and safe and stable operation, if but transformer station join string unreasonable, when its arbitrary 500 kilovolts of busbar overhaul, if another busbar fault trips, then may make electric network composition or system operation mode that larger change occurs, thus considerable influence is produced to system cloud gray model security and stability.
String problem is joined for 500 kv substation main electrical schemes, regulation in current Main Basis " 220kV ~ 500kV substations ' design technical regulation " (DL/T 5218-2005): " when adopting bus scheme with one and half breaker; electric power loop and load loop should be matched bunchiness; loop configuration of the same name is in difference string, and loop of the same name can be connected to the same side bus.When transformer number of units is more than two, other several transformers can not enter string, directly connect bus through circuit breaker ".This code also specifies: " in bus scheme with one and half breaker, when initial stage circuit and transformer are two complete strings, isolating switch should be installed in exit ".When 500 kv substation main electrical schemes join string planning and designing, except above-mentioned regulations stipulate, also need to consider field condition and economic factor, comprise the geographical position of transformer station, outlet direction, minimizing crossing elimination, avoid line switching interval, save framework rolled steel dosage and wire, gold utensil quantity etc.Operation adaptability problem after being constructed and put into operation for transformer station, generally only analyzes for typical operation modes, therefore joins string scheme and differs and adapt to the changeable actual operating of transformer station surely.
China's electrical network is fast-developing in recent years, a large amount of newly-built enlarging 500 kv substation, there are more 500 kv substations being in planning construction transition stage in electrical network, for the transformer station of built by separate periods in the transitional period longer or the later stage, engineering was not constructed and put into operation on schedule, there is the more problem of imperfect string in its transition stage, thus be unfavorable for keeping electric network composition integrality and maintenance system security of operation stability under fault condition, there is larger operation risk.In addition, the planning and designing boundary condition of minority transformer station there occurs change afterwards, Practical Project construction and its planning and designing inconsistent, be also cause joining one of in-problem reason of string.Therefore, from a busbar overhaul, another busbar trip situation, join string electric network composition changed and the angle analysis of system cloud gray model safety and stability impact, the transformer station in actual motion its join string and may there is security hidden trouble, be necessary to be optimized perfect.
Summary of the invention
The object of the invention is for 3/2 conventional main wiring mode of 500 kv substations, string is joined on the angle that electric network composition changes and system cloud gray model safety and stability affects from a busbar overhaul, another busbar trip situation, a kind of Substation Bus Arrangement is provided to join string optimization method, what the method can improve 3/2 main electrical scheme joins string scheme, reduce and join string to the change of electric network composition and reduction operation of power networks risk, improve power system operation safety and stability level.
The object of the present invention is achieved like this: a kind of Substation Bus Arrangement joins string optimization method, described in comprise the steps:
The first step: determine whether transformer station is in the transition stage of planning construction, if be "Yes", then carries out second step, if be "No", then directly carries out the 3rd step;
Second step: acquisition transformer station's successive projects plan and final main electrical scheme join string scheme;
3rd step: determine whether transformer station has power plant to send line access, if be "Yes", then carries out the 4th step, if be "No", then directly carries out the 5th step;
4th step: optimize current power plant of joining in string and send line access mode;
5th step: determine whether transformer station has main transformer, if be "Yes", then carries out the 6th step, if be "No", then directly carries out the 7th step;
6th step: optimize current main transformer access way of joining in string;
7th step: optimize and currently join string, avoids or alleviates its adverse effect to electric network composition;
8th step: optimize and currently join string, avoids or alleviates its adverse effect to system load flow.
The Optimization Steps of described 4th step is:
First determine that power plant sends line access mode Problems existing from following three aspects:
1. string is joined when transformer station's double-bus loses by the transformer station accessing power plant, mains side unit is thrown to the receiving end of electrical network;
2. Large Copacity power plant uniquely sends line and does not run with imperfect string mode, loses high power station unit full cut-off in situation to avoid transformer station's double-bus;
3. when power plant large sized unit adopts non-unit connection, it is sent line and should not be made into complete string with the main transformer of transformer station and run, to avoid main transformer or low-pressure side circuit overload.
Again according to above-mentioned three aspect problems stable condition really, if there is any one or more aspects problem, then correspondingly adjust power plant and send line in current on-position of joining in string, avoid or alleviate current string of joining sending power plant's electric power and the adverse effect of operation of power networks.
The Optimization Steps of described 6th step is:
First from following two aspect determination main transformer access way Problems existing:
1. the unique main transformer of transformer station should not run with imperfect string;
2. have the transformer station of multiple stage main transformer, multiple stage main transformer is unsuitable all to be run with imperfect string.
Again according to above-mentioned two aspect problems stable condition really, if there is the problem of any one or two aspects, then correspondingly optimize and revise main transformer in current on-position of joining in string, avoid or reduce transformer station losing main transformer.
The Optimization Steps of described 7th step is:
First determine from following five aspects currently to join the adverse effect of string to electric network composition:
1. current string of joining does not destroy the main grid structure structure of electrical network when transformer station's another busbar trip of arbitrary busbar overhaul loses double-bus, keeps main grid structure structural intergrity;
2. current string of joining is under transformer station's double-bus loses situation, at least keeps a passage, avoid partial electric grid and major network off-the-line between partial electric grid and major network;
3. currently join unidirectional double back or multi circuit transmission lines in string and should not be made into complete string or all run with imperfect string;
4. the current circuit being made into complete string, avoid being divided by electrical network when series operation is deviate from by transformer station after two mother loses;
5. transformer station have two and above main channel respectively bunchiness time, current string of joining will be avoided at adjacent interval, with exemption from inspection or capital construction coordinate have a power failure time because there is the situation with stopping not in safe distance.
Again according to above-mentioned five aspect problems stable condition really, if there is the problem of any one or more aspect, then correspondingly optimize and revise and currently join string, avoid or alleviate currently joining the adverse effect of string to electric network composition.
The Optimization Steps of described 8th step is:
First determine from following three aspects currently to join the adverse effect of string to system load flow:
1. main electrical scheme is joined string and will be avoided because the two mother of transformer station loses and cause main passway for transmitting electricity destroyed thus a large amount of power flow transfer occurs;
2. two circuits that complete string runs are made into or the direction of tide of circuit and transformer should be chosen as one-in-and-one-out as far as possible;
If 3. You Liangge power plant accesses same transformer station, then Liang Ge power plant inlet wire to be avoided to be made into complete string.
Again according to above-mentioned three aspect problems stable condition really, if there is the problem of any one or more aspect, then correspondingly optimize and revise and currently join string, avoid or alleviate electrical network a large amount of power flow transfer occurs.
Compared with prior art, advantage of the present invention is:
The present invention is directed to 3/2 mode of connection that current 500 kilovolts of plant stands are conventional, from transformer station's busbar overhaul, in another busbar trip situation, current string of joining is on the angle that electric network composition changes and system cloud gray model safety and stability affects, send line and main transformer access way from power plant and join string to aspects such as the impacts of electric network composition and system load flow, current string is joined to it, a kind of exercisable string of joining is provided to optimize and revise method, both can solve or alleviate the safety and stability hidden danger that transformer station causes electrical network that puts into operation, improve power system safety and stability operation level, also a kind of technical method can be provided to substation planning design and evaluation thereof, the adverse effect of string to system safety stable operation is joined from source solution is unreasonable.In addition, to being in the transitional transformer station of planning construction, string scheme can also be joined in conjunction with its follow-up project planning and final main electrical scheme, improving the feasibility of joining string optimization method and implementing.
Accompanying drawing explanation
Fig. 1 is optimization method overview flow chart of the present invention.
Fig. 2 is that string figure joins in the embodiment of the present invention 1 Luo Fang transformer station.
To be that the embodiment of the present invention 2 decorated archway transformer station is current join string figure to Fig. 3.
Fig. 4 is that final period is joined string figure by the embodiment of the present invention 2 decorated archway transformer station.
Join in string figure at the main electrical scheme shown in Fig. 2 ~ 4: Filled Rectangle block is denoted as the current switch put into operation, hollow rectangle block is denoted as the switch in the current planning not yet put into operation; The numeral on switch side is the numbering of switch; Solid line with arrow is denoted as the current circuit that put into operation or transformer, and arrows is access point, and the dotted line of band arrow is denoted as circuit in the current planning not yet put into operation or transformer, and arrows is access point; Line end is line name, and the arrow near line name and figure denote are the active power size and Orientation on circuit, and the unit of active power is megawatt; MX1 and MX2 is denoted as a bus and No. two buses respectively; ZB1 and ZB2 is denoted as a main transformer and No. two main transformers respectively; The arrow on transformer title side and figure denote are the active power size and Orientation of transformer, and the unit of active power is megawatt.
Embodiment
By reference to the accompanying drawings, the invention will be further described for following examples.
As shown in Figure 1, a kind of Substation Bus Arrangement of the present invention is joined string optimization method and is comprised the steps:
The first step: determine whether transformer station is in the transition stage of planning construction.
In this step, determine the current transition period whether being in its planning construction of transformer station, if be "Yes", then proceed to second step, if be "No", then proceed to the 3rd step described later.
Second step: acquisition transformer station's successive projects plan and final main electrical scheme join string scheme.
To the transformer station being in planning construction transition period, it is just interim that its current main electrical scheme joins string, generally there is the problem that imperfect string is more, thus electric network composition integrality and system cloud gray model security and stability under being unfavorable for keeping fault condition.Along with successive projects construction is gone into operation, it is corresponding supplementary that its main electrical scheme joins string, until reach the final target of substation planning.To this type of transformer station, it is joined string and optimizes needs according to substation planning design, carries out, for this reason in conjunction with successive projects and final target, collect transformer station's successive projects planning from Electric Power Network Planning department or designing unit and final main electrical scheme joins string scheme, join the condition of string optimization as Substation Bus Arrangement.
3rd step: determine whether transformer station has power plant to send line access.
In this step, determine whether transformer station has accessed power plant and sent line, if be "Yes", then proceed to the 4th step, if be "No", then proceed to the 5th step described later.The power plant no matter accessing transformer station sends line and is one or many, derives from identical power plant or different power plant, as long as there is power plant to send line access transformer station, is all defined as "Yes".
4th step: optimize current power plant of joining in string and send line access mode.
In this step, first determine that power plant sends line access mode Problems existing from following three aspects:
1. string is joined when transformer station's double-bus loses by the transformer station accessing power plant, mains side unit should be thrown to the receiving end of electrical network;
2. Large Copacity power plant uniquely sends line and does not run with imperfect string mode, loses high power station unit full cut-off in situation to avoid transformer station's double-bus;
3. during the non-unit connection of power plant large sized unit, it is sent line and should not be made into complete string with the main transformer of transformer station and run, to avoid main transformer or low-pressure side circuit overload.
Again according to above-mentioned three aspect problems stable condition really, if there is any one or more aspects problem, then correspondingly adjust power plant and send line in current on-position of joining in string, avoid or alleviate current string of joining sending power plant's electric power and the adverse effect of operation of power networks.
5th step: determine whether transformer station has main transformer.
In this step, determine whether transformer station has accessed main transformer, if be "Yes", then proceed to the 6th step, if be "No", then proceed to the 7th step described later.The main transformer no matter accessing transformer station is one or multiple stage, capacity or model are identical or different, as long as there is main transformer to access transformer station, is all defined as "Yes".The switchyard of main transformer is not had then to be defined as "No".
6th step: optimize current main transformer access way of joining in string.
In this step, first from following two aspect determination main transformer access way Problems existing:
1. the unique main transformer of transformer station should not run with imperfect string;
2. have the transformer station of multiple stage main transformer, multiple stage main transformer is unsuitable all to be run with imperfect string.
Again according to above-mentioned two aspect problems stable condition really, if there is the problem of any one or two aspects, then correspondingly optimize and revise main transformer in current on-position of joining in string, avoid or reduce transformer station losing main transformer.
7th step: optimize and currently join string, avoids or alleviates its adverse effect to electric network composition.
In this step, first determine from following five aspects currently to join the adverse effect of string to electric network composition:
1. current string of joining does not destroy the main grid structure structure of electrical network when transformer station's another busbar trip of arbitrary busbar overhaul loses double-bus, keeps main grid structure structural intergrity;
2. current string of joining is under transformer station's double-bus loses situation, at least keeps a passage, avoid partial electric grid and major network off-the-line between partial electric grid and major network;
3. currently join unidirectional double back or multi circuit transmission lines in string and should not be made into complete string or all run with imperfect string;
4. the current circuit being made into complete string, avoid being divided by electrical network when series operation is deviate from by transformer station after two mother loses;
5. transformer station have two and above main channel respectively bunchiness time, current string of joining will be avoided at adjacent interval, with exemption from inspection or capital construction coordinate have a power failure time because there is the situation with stopping not in safe distance.
Again according to above-mentioned five aspect problems stable condition really, if there is the problem of any one or more aspect, then correspondingly optimize and revise and currently join string, avoid or alleviate currently joining the adverse effect of string to electric network composition.
8th step: optimize and currently join string, avoids or alleviates its adverse effect to system load flow.
In this step, first determine from following three aspects currently to join the adverse effect of string to system load flow:
1. wiring is joined string and will be avoided because the two mother of transformer station loses and cause main passway for transmitting electricity destroyed thus a large amount of power flow transfer occurs;
2. the direction of tide being made into two circuits (or circuit and transformer) that complete string runs should be chosen as one-in-and-one-out as far as possible;
If 3. You Liangge power plant accesses same transformer station, then Liang Ge power plant inlet wire to be avoided to be made into complete string.
Again according to above-mentioned three aspect problems stable condition really, if there is the problem of any one or more aspect, then correspondingly optimize and revise and currently join string, avoid or alleviate electrical network a large amount of power flow transfer occurs.
Operating electric power system is an entirety, its power plant sends line and main transformer of transformer substation access way is directly related with electric network composition, and the direct influential system trend distribution of electric network composition, therefore, above-mentioned 4th step, the 6th step, between the 7th step and the 8th step, also there is above-mentioned dependence, namely in the 4th step or the 6th step, Problems existing can cause the adverse effect in the 7th step or the 8th step, solved if these problems join string by optimization in the 4th step or the 6th step, then also solved the problem in the 7th step or the 8th step accordingly.But the 7th step contains other electric network composition problem except power plant sends line and main transformer of transformer substation access way more.Similarly, the unreasonable electric network composition in the 7th step can influential system trend distribute, if join falsification by optimization to be apt to electric network composition, then correspondingly may solve the adverse effect of electric network composition to trend.But the 8th step comprises the problem of other influential system trend except electric network composition more, that is, join string even if current and under two mother loses situation, electric network composition is had no adverse effect, still may produce significant adverse impact to system load flow distribution.In addition, due to other reason such as field condition and economic factor, not all problem or adverse effect or all can both must pass through optimization and join string and solve, therefore join that string optimization method makes every effort to simple, quantities is little and easy to implement, thus improve the feasibility and economy of joining string optimization method.
Embodiment 1:
The present embodiment is the test that optimization method of the present invention carries out in Central China Power Grid 500 kilovolts of Luo Fang transformer stations.The main electrical scheme of this transformer station joins string as shown in Figure 2.
The first step: determine whether transformer station is in the transition stage of planning construction.
Luo Fang transformer station 500 kilovolts of systems are made up of 4 complete strings and 1 imperfect string, run, be defined as not being the transition period being in planning construction, proceed to the 3rd step close to complete complete string.
3rd step: determine whether transformer station has power plant to send line access.
As shown in Figure 2, Luo Fang transformer station 500 kilovolts of system access 2 main transformers and 7 loop line roads, 7 loop line roads are respectively from Meng Shan transformer station 2 times, Anyuan transformer station 2 times, mountain of papers transformer station 2 times, transformer station of Fuzhou City 1 time, all circuits are all from transformer station instead of power plant, therefore Luo Fang transformer station does not have power plant to send line access, proceeds to the 5th step.
5th step: determine whether transformer station has main transformer.
There are 2 main transformers in Luo Fang transformer station, wherein a bus bar side of main transformer access the 2nd string, and No. two bus bar side of No. two main transformer access the 1st strings, proceed to the 6th step.
6th step: optimize current main transformer access way of joining in string.
First determine whether one or more main transformer of transformer station all runs with imperfect string.It is all complete string that the 1st string and the 2nd that 2 main transformers of Luo Fang transformer station access is gone here and there, and therefore current to join the access way of main transformer in string be rational, without the need to optimizing and revising.
7th step: optimize and currently join string, avoids or alleviates its adverse effect to electric network composition.
First determine from following five aspects currently to join the adverse effect of string to electric network composition:
①Luo mill transformer station is current joins in string, dream sieve II line runs with imperfect string mode, dream sieve I line and sieve are comforted line and are made into complete string, under sieve mill becomes 500 kilovolts of two female decompression situations, can find out according to Jiangxi 500 kv grid winding diagram, now Jiangxi southwest electrical network and Jiangxi major network are opened in 500 kilovoltage grading layer emaciated faces, and Jiangxi Province Power Network 500 kilovolts of main grid structure structures are isolated, and destroy main grid structure structural intergrity.
2. be similar to above-mentioned 1. aspect analysis, current string of joining is under 500 kv substation double-buss lose situation, and the dream sieve double loop passage between Jiangxi southwest electrical network and Jiangxi major network and sieve are comforted single return path and all lost.
3. Luo Fang power station becomes and current joining in string there is not unidirectional double loop or multi circuit transmission lines and be made into complete string or all with the situation of imperfect string operation.
4. the current circuit being made into complete string, by 500 kv grid divisions when avoid deviating from series operation from transformer station after two mother loses.
String is joined according to Luo Fang transformer station is current, under 500 kilovolts of two mothers lose situation, Luo Wen II tape No. two main transformers go here and there out string from first, Luo An I tape main transformer goes here and there out string from second, Luo An II line and Luo Wen I line go here and there out series operation after string from the 3rd, and therefore sieve mill becomes two main transformers and still runs.But the dream sieve II line tripping operation run with imperfect string in the 4th string, and dream sieve I line and sieve are comforted I line and are gone here and there out series operation after string from the 5th, thus make Jiangxi southwest electrical network and Jiangxi major network get in touch with one three of 500 kilovoltage grade aspects to trip and disconnect, another two enter Jiangxi major network from the electrical network disengagement of southwest, Jiangxi, therefore cause Jiangxi southwest electrical network and Jiangxi major network to throw off equally to run, 500 kilovolts, Jiangxi main grid structure structure is imperfect.
⑤Luo mill transformer station does not have the situation of two and above main channel difference bunchiness.
According to the problem of the above-mentioned 1. aspect, Luo Wen I line reconfiguration in going here and there the 3rd is made into complete string to the 4th string with dream sieve II line, like this under sieve mill becomes 500 kilovolts of two female decompression situations, series operation after dream sieve II line and Luo Wen I line go out to go here and there from Luo Fang transformer station, Jiangxi southwest electrical network and Jiangxi major network maintain dream mountain to mountain of papers interconnection 500 kilovolts of aspects, and Jiangxi 500 kv grid structure still keeps complete.After taking above-mentioned optimization to join string measure, between Jiangxi southwest electrical network and Jiangxi major network, three times interconnections under normal circumstances still maintain one time under the two mother of Luo Fang transformer station loses situation, and the problem of above-mentioned the 2. problem and the 4. aspect of aspect is all solved.
8th step: optimize and currently join string, avoids or alleviates its adverse effect to system load flow.
First determine from following three aspects currently to join the adverse effect of string to system load flow:
1., after the two mother of transformer station loses, the circuit in imperfect string or main transformer will trip out of service, and the circuit in same complete string will deviate from rear series operation from transformer station.Because the direction of tide in different running method line is different, system load flow change when therefore losing two mother under different modes is also different, thus avoids a large amount of power flow transfer to carry out joining string conceptual design when should lose with the lower couple mother of typical operation modes.For Luo Fang transformer station, Luo Wen double loop be access mountain of papers transformer station Jinggang Mountain second phase power plant send passage, therefore the electric power of Shi Luo mill transformer station sends into line, in addition dream sieve double loop also mainly as electric power send into line run, Luo An double loop and two main transformers off line, be that electric power is sent.Electric power is not sent into line and electric power and is sent line and be made into complete string by current joining in string, therefore will have obvious power flow changing under two mother loses situation.
Although 2. the 2nd string and the 5th string are complete strings, the direction of tide of its circuit is unreasonable, and the Luo An I line in the 2nd string and a main transformer are all that electric power sends line, and it is all that electric power sends into line that the dream sieve I line in the 5th string and sieve comfort I line.
③Luo mill transformer station does not have power plant to send line directly to access.
In order to solve the problem of the above-mentioned the 1. 2. aspect, aspect and the, the Luo An II line reconfiguration in can going here and there the 3rd be made into complete string to the 5th string with dream sieve I line, Luo An I line and sieve are comforted I line all reconfiguration be made into complete string to the 3rd string.Like this to join the Line Flow that string Optimized Measures both met in complete string (the 3rd string and the 5th go here and there) be one-in-and-one-out, the size passing in and out trend is also made more to mate, reduce to greatest extent two mother lose situation under system load flow transfer, and maintain better electric network composition integrality (two mother lose rear Jiangxi southwest electrical network and Jiangxi major network 500 kilovolts of aspects add the 5th go here and there in dream mountain to Anyuan and the 3rd go here and there in twice, Anyuan to Fuzhou City interconnection), but need reconfiguration comparatively multi-line, quantities is larger.
Comprehensive the above, for Luo Fang transformer station, the irrational problem in Line Flow direction in main grid structure structural integrity and complete string can not be kept after the two mother of main existence loses, according to optimization method of the present invention, complete string is made into the 4th string with dream sieve II line by the Luo Wen I line reconfiguration in the 3rd string, Luo An II line reconfiguration in going here and there the 3rd is made into complete string to the 5th string with dream sieve I line, Luo An I line and sieve are comforted I line all reconfiguration to the 3rd string be made into complete string, by joining string optimization, can at Luo Fang transformer station busbar overhaul, power flow transfer after keeping main grid structure structural intergrity in another busbar trip situation preferably and reducing the system failure, solve and currently join string Problems existing, thus improve the safe and stable operation level of system.In conjunction with factors such as substation field condition and economy, also the Luo Wen I line reconfiguration in can only going here and there the 3rd is made into complete string to the 4th string with dream sieve II line, under keeping fault condition, system configuration is complete, this string optimization method of joining only needs reconfiguration existing line to the existing vacant interval closed on, be easy to construction and quantities is little, economically feasible, therefore, the present embodiment is as the optimization method recommended.
Embodiment 2:
The present embodiment is the test that optimization method of the present invention carries out in Central China Power Grid 500 kilovolts of decorated archway transformer stations.The current main electrical scheme of this transformer station joins string as shown in Figure 3.
The first step: determine whether transformer station is in the transition stage of planning construction.
Decorated archway transformer station 500 kilovolts of systems are current 5 strings, is all imperfect string, is defined as the transition stage being in planning construction, proceeds to second step.
Second step: acquisition transformer station's successive projects plan and final main electrical scheme join string scheme.
According to the planning and designing of decorated archway substation bus arrangement, final planning installing two 750MVA main transformers, 500 kilovolts of final outlets 8 times.The final main electrical scheme of decorated archway transformer station 500 kilovolts of systems joins string as shown in Figure 4, and the long II line of board wherein and No. two main transformers are about to put into operation.
3rd step: determine whether transformer station has power plant to send line access.
As shown in Figure 3, decorated archway transformer station 500 kilovolts of system access 1 main transformer and 4 loop line roads, 4 loop line roads are respectively from 2 times, red stain power station, gorgeous mountain, Chang Yangpu transformer station 1 time, Tuo Kou power plant (2 × 200,000 kilowatts) 1 time, therefore decorated archway transformer station has power plant to send line access, proceeds to the 4th step.
4th step: optimize current power plant of joining in string and send line access mode.
First determine that power plant sends line access mode Problems existing from following three aspects:
1. license support Xian Shituokou power plant uniquely send line, after the two mother of 500 kilovolts, decorated archway transformer station loses, the license support line tripping operation run with imperfect string mode, Tuo Kou power plant loses and uniquely sends line and unit full cut-off, does not have unit to be thrown to sending end electrical network.
The line license support line of uniquely sending of ②Tuo Kou power plant runs with imperfect string mode, but due to only 400,000 kilowatts, Tuo Kou power plant two machines, installed capacity is little, can not carry out joining string optimization for this problem.
3. license support line runs not being made into complete string with the main transformer of decorated archway transformer station.
5th step: determine whether transformer station has main transformer.
There is a main transformer in decorated archway transformer station, and a bus bar side of access the 1st string, proceeds to the 6th step.
6th step: optimize current main transformer access way of joining in string.
1. the unique main transformer of decorated archway transformer station is current runs with imperfect string.
2. current decorated archway transformer station only has a main transformer, and current do not exist multiple stage main transformer all with the situation that imperfect string runs.
According to decorated archway planning scheme, the long II line of board and No. two main transformers are about to put into operation, wherein access the 1st is gone here and there to join with main transformer and is gone here and there complete string by board long II line, access the 2nd string is made into complete string with board long I line by No. two main transformers, therefore decorated archway main transformer of transformer substation will no longer run with imperfect string mode, current problem will be constructed and put into operation along with Near Future Project and be solved, thus not need to carry out this joining string optimization.
7th step: optimize and currently join string, avoids or alleviates its adverse effect to electric network composition.
First determine from following five aspects currently to join the adverse effect of string to electric network composition:
1. current 5 strings of decorated archway transformer station being in planning construction transition period are all imperfect string, when two mother loses, article four, circuit and a main transformer will all trip, electric network composition changes larger, but because decorated archway transformer station is in Southwestern Hunan, China electrical network inside, Hunan Electric Grid main grid structure structure still keeps complete.
2. decorated archway transformer station is positioned at Southwestern Hunan, China electrical network inside, coupled each 500 kilovolt are not all the interconnections between partial electric grid and Hunan major network, the current string of joining of decorated archway transformer station, under its 500 kilovolts of double-buss lose situation, can not cause off-the-line between partial electric grid and major network.
3. the current gorgeous board in same direction I, II loop line of joining in string of decorated archway transformer station all runs with imperfect string.
4. decorated archway transformer station is current does not have complete string.
5. the current situation not having two and above main channel difference bunchiness of decorated archway transformer station.
According to the problem of above-mentioned 3. aspect, simultaneously in conjunction with decorated archway substation planning design and recent successive projects construction plan, join string to decorated archway transformer station to be optimized, long for board in successive projects II line is received the 3rd string and be made into complete string with gorgeous board II line, thus avoid unidirectional gorgeous board double loop all to run with imperfect string.
8th step: optimize and currently join string, avoids or alleviates its adverse effect to system load flow.
In this step, first determine from following three aspects currently to join the adverse effect of string to system load flow:
1. decorated archway transformer station to be in Southwestern Hunan, China electrical network inner, its 500 kilovolts two mothers lose and main passway for transmitting electricity can not be caused to be destroyed, current decorated archway transformer station line related and main transformer trend all less, a large amount of power flow transfer can not be caused.
2. owing to being all imperfect string, therefore there is not the unreasonable problem of direction of tide in string.
3., there is not the problem that Liang Ge power plant inlet wire is made into complete string in Jin Youyige power plant access decorated archway transformer station.
Comprehensive the above, for decorated archway transformer station, mainly there is low capacity power plant and uniquely send line, unique main transformer and unidirectional gorgeous board I, II loop line is all with the problem that imperfect string mode runs, these problems are all because this transformer station is in caused by planning construction transition stage, design according to decorated archway substation planning, in conjunction with its recent successive projects plan, adopt optimization method provided by the invention, receive the 3rd string by the long II of the board in recent successive projects line and be made into complete string with gorgeous board II line, solve unidirectional gorgeous board double loop all with the problem that imperfect string runs, other problem all will be constructed and put into operation along with successive projects and progressively be resolved.Join in string optimization method this, only the gorgeous board II line being about to put into operation in planning need be moved to the spare space in the 3rd string by the 1st string, neither need to carry out bus to change sides, also reconfiguration does not have circuit or takies planning interval, quantities is minimum, be easy to construction, being that one is economically viable joins string optimization method.
Optimization method of the present invention is not limited to the quantity of the string that transformer station has, and is not limited to transformer substation voltage grade yet, as long as adopt 3/2 main wiring mode, all can adopt optimization method of the present invention.Optimization method of the present invention both may be used for joining string to the current main electrical scheme of the transformer station that puts into operation and had been optimized adjustment, also can adopt when Substation Bus Arrangement joins string conceptual design and examination thereof.
Relevant data described herein and equipment are the specific embodiment of patent of the present invention, are illustrating patent spirit work of the present invention.Patent person of ordinary skill in the field of the present invention can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from the spirit of patent of the present invention or surmount the scope that appended claims defines.
Claims (1)
1. Substation Bus Arrangement joins a string optimization method, it is characterized in that comprising the steps:
The first step: determine whether transformer station is in the transition stage of planning construction, if be "Yes", then carries out second step, if be "No", then directly carries out the 3rd step;
Second step: acquisition transformer station's successive projects plan and final main electrical scheme join string scheme;
3rd step: determine whether transformer station has power plant to send line access, if be "Yes", then carries out the 4th step, if be "No", then directly carries out the 5th step;
4th step: optimize current power plant of joining in string and send line access mode, its concrete Optimization Steps is:
First determine that power plant sends line access mode Problems existing from following three aspects:
1. string is joined when transformer station's double-bus loses by the transformer station accessing power plant, mains side unit is thrown to the receiving end of electrical network;
2. Large Copacity power plant uniquely sends line and does not run with imperfect string mode, loses high power station unit full cut-off in situation to avoid transformer station's double-bus;
3. during the non-unit connection of power plant large sized unit, it is sent line and should not be made into complete string with the main transformer of transformer station and run, to avoid main transformer or low-pressure side circuit overload;
Again according to above-mentioned three aspect problems stable condition really, if there is any one or more aspects problem, then correspondingly adjust power plant and send line in current on-position of joining in string, avoid or alleviate current string of joining sending power plant's electric power and the adverse effect of operation of power networks;
5th step: determine whether transformer station has main transformer, if be "Yes", then carries out the 6th step, if be "No", then directly carries out the 7th step;
6th step: optimize current main transformer access way of joining in string, its concrete Optimization Steps is:
First from following two aspect determination main transformer access way Problems existing:
1. the unique main transformer of transformer station should not run with imperfect string;
2. have the transformer station of multiple stage main transformer, multiple stage main transformer is unsuitable all to be run with imperfect string;
Again according to according to above-mentioned two aspect problems stable condition really, if there is the problem of any one or two aspects, then correspondingly optimize and revise main transformer in current on-position of joining in string, avoid or reduce transformer station losing main transformer;
7th step: optimize and currently join string, avoid or alleviate its adverse effect to electric network composition, its concrete Optimization Steps is:
First determine from following five aspects currently to join the adverse effect of string to electric network composition:
1. current string of joining does not destroy the main grid structure structure of electrical network when transformer station's another busbar trip of arbitrary busbar overhaul loses double-bus, keeps main grid structure structural intergrity;
2. current string of joining is under transformer station's double-bus loses situation, at least keeps a passage, avoid partial electric grid and major network off-the-line between partial electric grid and major network;
3. currently join unidirectional double back or multi circuit transmission lines in string and should not be made into complete string or all run with imperfect string;
4. the current circuit being made into complete string, avoid being divided by electrical network when series operation is deviate from by transformer station after two mother loses;
5. transformer station have two and above main channel respectively bunchiness time, current string of joining will be avoided at adjacent interval, with exemption from inspection or capital construction coordinate have a power failure time because there is the situation with stopping not in safe distance;
Again according to above-mentioned five aspect problems stable condition really, if there is the problem of any one or more aspect, then correspondingly optimize and revise and currently join string, avoid or alleviate currently joining the adverse effect of string to electric network composition;
8th step: optimize and currently join string, avoid or alleviate its adverse effect to system load flow, its concrete Optimization Steps is:
First determine from following three aspects currently to join the adverse effect of string to system load flow:
1. main electrical scheme is joined string and will be avoided because the two mother of transformer station loses and cause main passway for transmitting electricity destroyed thus a large amount of power flow transfer occurs;
2. two circuits that complete string runs are made into or the direction of tide of circuit and transformer should be chosen as one-in-and-one-out as far as possible;
If 3. You Liangge power plant accesses same transformer station, then Liang Ge power plant inlet wire to be avoided to be made into complete string;
Again according to three aspect problems stable condition really in above-mentioned 8th step, if there is the problem of any one or more aspect, then correspondingly optimize and revise and currently join string, avoid or alleviate electrical network a large amount of power flow transfer occurs.
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| CN106300362B (en) * | 2016-09-22 | 2018-09-11 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of 4/3rds wiring patterns controlling four times Line Flows for UPFC |
| CN106451518B (en) * | 2016-10-13 | 2019-03-08 | 国家电网公司 | A kind of method and system of determining flexible direct current power grid DC fields electrical main connecting wire |
| CN107959286B (en) * | 2017-11-13 | 2020-09-25 | 广东电网有限责任公司电力调度控制中心 | 3/2 wiring mode-based dynamic reconstruction method for power transmission network |
| CN110460039B (en) * | 2019-07-11 | 2021-06-22 | 山东电力工程咨询院有限公司 | Method and device for recommending wiring scheme of back pressure generator connected to electrical system |
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