CN105096019A - Provincial level power grid layering and partitioning typical power supply mode planning method - Google Patents
Provincial level power grid layering and partitioning typical power supply mode planning method Download PDFInfo
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Abstract
The invention provides a provincial level power grid laying and partitioning grid structure planning method, and includes the steps of: calculating power supply demand evaluation indexes of a power grid of each city or a city group, and performing city power grid development goal classification; evaluating a typical power supply mode of each city or the city group; evaluating adaptation of transmission channels among the cities or the city group; evaluating a capacity requirement of a provincial level power grid for external electricity, and judging whether to adopt other power supply mode according to the capacity requirement; and combing an analysis result, and forming a provincial level power grid layering and partitioning grid structure planning recommendation scheme. The method can realize effective layering planning of a city/city group power supply network, a 500kV provincial network backbone power grid and an ultrahigh-voltage direct current drop-point power grid, and can also realize comprehensive coordinated planning of 1000/500/220kV three-level power grids, thereby realizing comprehensive optimization of a layering objective and an overall objective.
Description
Technical field
The invention belongs to power system safety and stability analysis field, be specifically related to a kind of provincial power network layering and zoning typical case's powering mode planing method.
Background technology
Along with the development of economy, the demand of the energy is also become more and more urgent.Henan Electric Power system has achieved the progress of advancing by leaps and bounds since reform and opening-up, net capacity constantly increases, the continuous rising of electric pressure, form AC-DC hybrid power grid at present, contain AC network and the ± 800kV Hami-Zhengzhou extra-high voltage direct-current, back-to-back Lingbao City's direct current of each electric pressure of 1000kV, 500kV, 220kV, 110KV, 35kV, 10kV, 0.4kV.Electric system to be divided into some levels from top to bottom by electric pressure by divided power system structure, gives full play to the transmission benefit of electrical network at different levels, improves the whole network economic target.Electric system is marked off some power supply areas comprising different structure level by power supply capacity by sub area division structure, form the region that a supply and demand is in a basic balance, and be connected with adjacent area through interconnection, correct application sub area division model will extremely be conducive to actual motion and the development of electrical network.Under current intelligent grid construction background, increasing to power grid security reliability service and developing in harmony of electric pressure proposes new requirement, how different electric pressure electrical network is accurately located, meet power grid security reliable and economic run and coordinated development become more and more important.
Electric Power Network Planning conventional method i.e. scenario comparison method, generally comprise schematic design making, technical feature inspection and project plan comparison three steps; Normally according to the change of institute's research area's balance of electric power and ener situation, first existing grid structure adaptability is assessed, and propose the measure of corresponding grid structure adjusting and optimizing.But along with fast development and the probabilistic increase of power grid construction of load, similar local directed complete set scheme is difficult to the power network planning scheme building multi-voltage grade coordinated development from the overall situation.
Along with the development of electrical network, urban distribution network is progressively transitioned into from 110kV, 220kV electric pressure main grid structure and is formed main grid structure with 500kV electrical network, day by day become the important component part of provincial power network structure, progressively breach the concept of original " isoelectric point ", become to a certain extent left and right provincial power network grid structure, flow of power to key factor.How to build rational urban distribution network grid structure, meet power supply reliability and the security of important load center, ensure that urban distribution network is by power and distribution ability; How to build the provincial key power transmission network connecting city or group of cities on this basis, meet the transhipment of direction of energy flexibility and reliability, resist catastrophic failure and impact and prevent urban distribution network large-area power-cuts; On this basis, how to introduce external electric power and meet this province load growth requirement, how external electric power incorporates this province bulk transmission grid, not only meets this province demand but also ensure the safe and reliable power supply of this power saving host rack; This is all the problem needing further investigation.
Therefore, in conjunction with development reality and the future plan of China's electrical network, the technical matterss such as 1000/500/220kV provincial power network layering and zoning coordinated planning in the urgent need to address.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the invention is to propose a kind of provincial power network layering and zoning typical case's powering mode planing method of layering target and overall goals being carried out to complex optimum.
In order to realize foregoing invention object, the present invention takes following technical scheme:
A kind of provincial power network layering and zoning typical case's powering mode planing method, comprises the following steps:
Step one: the power demands evaluation index calculating each city or group of cities electrical network, and carry out the classification of urban distribution network developing goal;
Step 2: the typical powering mode assessing each city or group of cities electrical network;
Step 3: the adaptability assessing passway for transmitting electricity between each city or group of cities;
Step 4: assessment provincial power network externally carrys out the capacity requirement of electric power, and judges whether to take other power supply modes according to described capacity requirement;
Step 5: according to step 2, three, the result of four, form provincial power network layering and zoning typical case's powering mode planning suggested design.
In described step one, the computing formula of the power demands evaluation index of each city or group of cities electrical network is:
Wherein, L
ibe the bulk supply need assessment index of i-th urban distribution network, P
cibe the supply load capacity of i-th urban distribution network, P
cmaxfor the maximum supply load capacity in each urban distribution network, V
cibe the supply load scale factor of i-th urban distribution network, P
dibe the supply load density of i-th urban distribution network, P
dmaxfor the maximum supply load density in each urban distribution network, V
dibe the supply load density factor of i-th urban distribution network, i is urban distribution network quantity in provincial power network, i=1,2 ..., N-1, N.
In described step one, the classification of urban distribution network developing goal is the power demands evaluation index L with reference to each city or group of cities electrical network
isize is carried out, and concrete grammar is:
As 0.45≤L
iwhen≤1, be judged as the whole province key city, urban distribution network developing goal is build the 500kV looped network around city, and realizes 220kV sub area division districting operation;
As 0.25≤L
iduring <0.45, be judged as regional hub city, urban distribution network developing goal economizes net key passage formation chain type 500kV electrical network for relying on, and realizes this area 220kV sub area division districting operation, unlinks run with other ground utility grids;
As 0≤L
iduring <0.25, be judged as underdeveloped urban, urban distribution network developing goal is form 500kV looped network with contiguous urban distribution network, and the 500/220kV electromagnetic looped network retained between different cities runs.
In described step 2, assess each city or group of cities electrical network typical case powering mode comprise: short circuit current level assessment and evaluation of power supply capability.
Further, described short circuit current level appraisal procedure is: adopt PSD-SCCPC or PSD-SCCP short-circuit current program computation to go out each 500kV and 220kV busbar short-circuit current values size, and preset short-circuit current Numerical Control target; If the short-circuit current numerical value of 500kV and 220kV bus all meets control objectives, then illustrate that typical powering mode meets the demands; If control objectives can not be met, then adjust typical powering mode, until meet control objectives;
Described evaluation of power supply capability method is: adopt PSD-FDS full dynamic simulation program computation to obtain each city or group of cities mains supply capacity of water, and compare with each city or group of cities mains supply capacity requirement; If power supply capacity size meets each city or group of cities mains supply capacity requirement, then the scheme selecting power supply capacity maximum is as typical powering mode; If do not meet, then adjust typical powering mode, until meet city or group of cities mains supply capacity requirement.
In described step 3, assess passway for transmitting electricity adaptability between each city or group of cities and comprise: Static security assessment and transient security assessment.
Further, described Static security assessment method is: after adopting PSD-BPA Load Flow Program computational analysis arbitrary time 500kV circuit or transformer non-fault N-1 to disconnect, whether there is other element overloads; If without other element overloads, then illustrate that passway for transmitting electricity static security meets the demands; If there is other element overloads, then adjust passway for transmitting electricity rack, until meet static security requirement;
Described transient security appraisal procedure is: after adopting PSD-BPA transient state program computation to analyze arbitrary time 500kV circuit or Three-Phase Transformer short circuit N-1 fault, whether cause destabilization problems; If there is not destabilization problems, then illustrate that passway for transmitting electricity transient security meets the demands; If there is destabilization problems, then adjust passway for transmitting electricity rack, until meet transient security requirement; Described destabilization problems is electrical network merit angle unstability, Voltage Instability or dynamic buckling.
The concrete grammar of described step 4 is:
If the capacity requirement that provincial power network externally carrys out electrical network reaches preset value, then by existing provincial power network and outer net interconnection safe transport, do not consider to adopt other power supply modes;
If the capacity requirement that provincial power network externally carrys out electrical network reaches preset value, then consider to adopt in extra-high-voltage alternating current or extra-high voltage direct-current transmission mode, and analyze further the adaptability of external electric power at extra-high-voltage alternating current or extra-high voltage direct-current transmission mode provincial power network.
Further, if some areas electrical network externally carrys out electric power capacity requirement and is less than 3000MW in provincial power network, then by existing provincial power network and outer net interconnection safe transport, do not consider to adopt other power supply modes;
If some areas electrical network externally carrys out electric power capacity requirement and reaches 3000-5000MW in provincial power network, then consider to adopt ultra-high voltage AC transmission mode, and ensure that 500kV power network line and Three-Phase Transformer short circuit N-1 fault all do not cause electrical network unstability, and without element overload;
If some areas electrical network externally carrys out electric power capacity requirement and reaches 5000-8000MW in provincial power network, then consider to adopt extra-high voltage direct-current transmission mode, and ensure the 500kV electrical network of direct current drop point under normal, N-1 fault and N-2 failure condition effectively short-circuit ratio all more than 2.5.
Compared with prior art, beneficial effect of the present invention is:
By the clearly each city of balance of electric power and ener or group of cities power network development target and typical powering mode, contribute to realizing urban distribution network in the recent period and effective linking of planning of medium-long term; Assess the adaptability of passway for transmitting electricity between each city/group of cities, build the key power transmission network of provincial power network 500kV, contribute to promoting the flexible turn-over capacity of provincial key electric network swim further; According to external electricity needs, 1000kV alternating current-direct current electrical network drop point of making rational planning for, formulates 1000/500kV electric network coordination development strategy.Compared with additive method, the method both can realize economizing to city/group of cities power supply network, 500kV the effective hierarchical planning netting key electrical network, extra-high voltage alternating current-direct current drop point electrical network, the comprehensive coordination planning between 1000/500/220kV tri-grades of electrical networks can be realized again simultaneously, achieve the complex optimum of layering target and overall goals.
Accompanying drawing explanation
Fig. 1 is provincial power network layering and zoning typical case's powering mode planing method schematic flow sheet;
Fig. 2 is Henan Electric Power System structural representation in the embodiment of the present invention;
Fig. 3 is 220kV bus splitting near region, Song Shan electric network composition schematic diagram in the embodiment of the present invention;
When Fig. 4 is 220kV electrical network independent partitions, Zhengzhou in the embodiment of the present invention, 500kV gets in touch with variable power transmission ability schematic diagram;
When Fig. 5 is Zhengzhou 220kV electrical network 2 subregions in the embodiment of the present invention, 500kV gets in touch with variable power transmission ability schematic diagram;
Fig. 6 be in the embodiment of the present invention military Zhou Zhanzhu become put into operation after Zhengzhou area electric network composition schematic diagram;
Fig. 7 be in the embodiment of the present invention Gongyi, Zhengzhou, longitude and latitude put into operation after 220kV area power grid structural representation (point 3rd district);
Fig. 8 is that in the embodiment of the present invention, schematic diagram is optimized and revised for district's electric network composition in the north, Zhengzhou.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 the invention provides a kind of provincial power network layering and zoning grid structure planing method process flow diagram.
For the structural representation of Henan Electric Power System shown in Fig. 2, there is following embodiment:
Step one: prefectures and cities' network load, power supply, rack development plan in investigation provincial power network, each city of combing or group of cities power network development target;
Following table 1 for be depicted as Henan Electric Power System 2015,2020,2025, the year two thousand thirty load prediction data:
Table 1 Henan Electric Power System 2015,2020,2025, the year two thousand thirty load prediction data
For load level in 2015, each urban distribution network bulk supply need assessment index is calculated according to formula (1), for ease of analyzing, each urban distribution network supply load scale factor and supply load density factor are set to 0.5, and result of calculation is as shown in table 2:
Table 22015 year Henan Electric Power System each urban distribution network bulk supply need assessment index
In like manner can obtain each urban distribution network in Henan 2020,2025, the bulk supply need assessment index of the year two thousand thirty, associative list 2 result of calculation, the result of calculation in four load level years is as shown in table 3:
Table 3 Henan Electric Power System each urban distribution network bulk supply need assessment index
According to the power demands evaluation index L of each city or group of cities electrical network
isize carry out the classification of urban distribution network developing goal:
Zhengzhou, Luoyang, Jiaozhuo are judged as the whole province key city, and urban distribution network developing goal is build the 500kV looped network around city, and realizes 220kV sub area division districting operation;
Xinxiang, Anyang, tafelberg, Nanyang, Shangqiu, Jiyuan, Xuchang, Puyang, Luohe are judged as regional hub city, urban distribution network developing goal economizes net key passage formation chain type 500kV electrical network for relying on, realize this area 220kV sub area division districting operation, unlink with other ground utility grids and run;
Kaifeng, Hebi, Zhoukou City, Zhumadian, the Sanmenxia Gorge, Xinyang are judged as underdeveloped urban, and urban distribution network developing goal is form 500kV looped network with contiguous urban distribution network, and the 500/220kV electromagnetic looped network that appropriateness retains between different cities runs.
Step 2: the typical powering mode of each city or group of cities electrical network is determined in analytical calculation, realizes the development of typical powering mode 500/220kV electric network coordination;
Henan Electric Power System is totally 18 districts and cities, for the research of Zhengzhou electrical network typical case powering mode.Zhengzhou area electrical network is positioned at the core of Henan Province 500kV main grid structure, and direct current drop point in extra-high voltage sky---Central Region current conversion station is positioned at east, Zhengzhou, and its 500kV rack carries the interconnected important task of major network trend north and south intercommunication in Henan Province, thing.In addition, Zhengzhou electrical network receives and evacuate the important channel being subject to direct current power in sky on the spot, and rack importance and functions is very important.
Analyze using Zhengzhou City as typical urban, from step 2, Zhengzhou City is classified as the whole province key city, and corresponding goal for urban development is build the 500kV looped network around city, and realizes 220kV sub area division districting operation.
The subregion development trend of Zhengzhou area 220kV electrical network is divided into three phases, is respectively:
First stage: 220kV electrical network is 2, north and south subregion by independent partitions transition;
Subordinate phase: 220kV electrical network south subregion expands to 2 subregions;
Phase III: optimizing and revising of 220kV electrical network 3 subregion inside.
(1) first stage: 220kV electrical network is 2, north and south subregion by independent partitions transition
At present, 4, Zhengzhou area 500kV transformer station (Song Shan, Zhengzhou, military week, port owned by the government), wherein switchyard one (military week), 500kV connecting transformer 6,220kV electrical network independent partitions is run.Under standard-sized sheet line, full start-up mode, part 220kV busbar short-circuit electric current exceeds standard, and result of calculation is as shown in table 4.
Bus three short circuit current during the non-subregion of table 4 Zhengzhou area 220kV electrical network
Result of calculation according to table 4:
(1) Zhengzhou area 500kV electrical network aspect, after 500kV Ma Si-Song Shan-Zhengzhou takes circuit to go out the measure of string, the short circuit current level of Song Shan, station, Zhengzhou bus obtains good control.All in all, the 500kV busbar short-circuit levels of current of Zheng Beizhan is the highest, is 52.2kA.500kV high-voltage side bus short circuit current level of respectively standing in Zhengzhou area meets level of control.
(2) Zhengzhou area 220kV aspect, although Zhengzhou becomes 220kV bus taked split operation mode, Zhengzhou area 220kV busbar short-circuit electric current still has multistation to exceed standard.Wherein, 500kV 220kV side bus short-circuit current of respectively standing all exceeds standard, and station, Song Shan 220kV busbar short-circuit electric current exceeds standard at most, reaches 67.5kA.Take split operation measure to station, Song Shan 220kV bus, concrete measure as shown in Figure 3.Calculate the short-circuit current under this mode, result is as shown in table 5.
Bus three short circuit current (Song Shan denominator) during the non-subregion of table 5 Zhengzhou area 220kV electrical network
After denominator measure is taked at station, Song Shan, its 220kV bus three short circuit current is down to 48.9kA, but the 220kV bus three short circuit current level of 500kV Zhengzhou, port owned by the government, Zheng Beizhan still exceeds standard, and 220kV Xu Zhuan, Jin Dai become short circuit current level more than 50kA.Therefore, only to the problem that station, Song Shan takes denominator measure can not solve Zhengzhou area 220kV rack short circuit completely to exceed standard, also need to take partition running measure.
In conjunction with Zhengzhou area 220kV grid structure feature, and consider the prerequisite not reducing system operation reliability.Suggestion: centered by 500kV Zheng Bei, station, port owned by the government, contact Zhengzhou area is northern, east 220kV rack; Centered by station, 500kV Song Shan, station, Zhengzhou, contact Zhengzhou area is western, southern 220kV rack.Disconnect the 220kV interconnection between dividing between the northern and southern areas, comprising: rope river-Zheng Bei, Suo He-stone Buddhist, Zhengzhou-phoenix double back, Zhengzhou-sky unit, totally 5 circuits.2, north and south independently 220kV subregion can be formed.
After Zhengzhou area 220kV rack forms independent partitions, 2, north and south, the short-circuit current of 220kV rack aspect is controlled, and result of calculation is as shown in table 6.
Table 6 Zhengzhou area 220kV electrical network forms the bus three short circuit current after 2 subregions
Zhengzhou area 220kV electrical network is being before and after the subregion of 2, north and south by independent partitions transition, and the ability to transmit electricity of change to station, 500kV Song Shan, station, Zhengzhou, station, port owned by the government, Zheng Beizhan contact break-in 220kV electrical network of 220kV rack general layout has an impact.Need to carry out comparative study to this problem.
For the rack before and after the 220kV sub area division of Zhengzhou area, adopt the mode that load slowly increases, use whole process simulation means, under can calculating the different situations of 220kV electrical network independent partitions, Zhengzhou and 2 subregions respectively, the ability to transmit electricity that 500kV contact becomes as shown in Figure 4 and Figure 5.In simulation calculation, the initial load level of Zhengzhou area is 9407MW.
Result of calculation shows:
(1) 220kV electrical network in Zhengzhou area is when independent partitions, and the theoretical ability to transmit electricity that 500kV Song Shan, Zhengzhou, port owned by the government and Zheng Bei contact become amounts to 18415MW, compared to initial load level, also has power supply capacity nargin 9008MW.
(2), after 220kV electrical network in Zhengzhou area is divided into 2, north and south subregion, the ability to transmit electricity that 500kV Song Shan, the contact of station, Zhengzhou become is 12775MW; The ability to transmit electricity that 500kV port owned by the government, Zheng Bei contact become is 7236MW, amounts to 20011MW, compared to initial load level, also can increase power supply 10604MW.Compared to the situation of non-subregion, power supply capacity improves 1596MW.
After the military Zhou Zhanzhu change of 500kV puts into operation, the power supply zone contact of south, Zhengzhou area strengthens further, and electric network composition as shown in Figure 6.
After military all main transformers put into operation, south, Zhengzhou 220kV power supply zone adds original Song Shan and station, Zhengzhou, and will have south, band Zhengzhou, 3 500kV stations load, power supply reliability strengthens further.But with the enhancing of 220kV rack, may there is excessive problem in the short-circuit current of 220kV electrical network aspect, need to carry out Analysis of Short-Circuit Current.Military Zhou Zhanzhu becomes the calculation of short-circuit current result of the Zhengzhou area electrical network after putting into operation as shown in table 8.2-4.
Result of calculation shows, after military Zhou Zhanzhu becomes operation on-load, little on the short-circuit current impact of Zhengzhou area 220kV electrical network aspect, short-circuit current is all at below 45kA.South, Zhengzhou 500kV power supply zone can keep Song Shan, Zhengzhou, station contact military Wednesday to run, without the need to taking the measure of unlinking.
Table 7 Zhengzhou area 220kV electrical network 2 subregion calculation of short-circuit current results (military all main transformers put into operation)
(2) subordinate phase: 220kV electrical network south subregion expands to 2 subregions
According to existing programme, along with putting into operation in station, 500kV Gongyi, by its 1 1200MVA main transformer band Zhengzhou part 220kV electrical network.Like this, south, Zhengzhou power supply zone will develop into Gongyi, Song Shan, Zhengzhou, military all 4 stations, totally 6 500kV main transformer band south partition runnings.
Along with putting into operation in 500kV longitude and latitude station, there are two kinds of possible partition power supply plans in its 220kV side:
(1) be incorporated to existing In The South of Zhengzhou City part district, with Gongyi, Song Shan, Zhengzhou, military Zhou Chengwei mono-Ge Gong district, and on this basis this subregion further unlinked, make In The South of Zhengzhou City portions expand to 2 subregions;
(2) be incorporated to the northern subregion in existing Zhengzhou, become a Ge Gong district with Zheng Bei, port owned by the government;
Under full wiring, full start-up mode, carry out Analysis of Short-Circuit Current to above two schemes, result of calculation is as shown in table 8.
Table 8 longitude and latitude becomes the calculation of short-circuit current result of two kinds of partition power supply plans
Result of calculation shows, the Zheng Bei under two schemes, station, port owned by the government 220kV busbar short-circuit electric current all exceed standard, and need to take further restriction.Take scheme (1): then the 6 station 220kV busbar short-circuit electric currents such as longitude and latitude station, Zheng Nan, fly directly exceed standard; If the scheme of taking (1), subregion need be carried out to south, existing Zhengzhou power supply zone, take Gongyi+Song Shan, Zhengzhou+force week+pattern of longitude and latitude carries out subregion.The result of calculation of short-circuit current is as shown in table 9.
Table 9 longitude and latitude becomes the calculation of short-circuit current result being incorporated to partition scheme after southern subregion
| Sequence number | Bus name | Busbar voltage grade (kV) | Bus three short circuit current (KA) |
| 1 | Song Shan 500 | 500 | 52.481 |
| 2 | Zhengzhou 500 | 500 | 53.413 |
| 3 | Port owned by the government 500 | 500 | 51.224 |
| 4 | North, Zhengzhou 500 | 500 | 57.192 |
| 5 | Longitude and latitude 500 | 500 | 51.996 |
| 6 | Military week 500 | 500 | 48.002 |
| 7 | Gongyi 500 | 500 | 44.932 |
| 8 | Song Shan | 230 | 45.242 |
| 9 | Zhengzhou | 230 | 32.917 |
| 10 | Port owned by the government | 230 | 49.611 |
| 11 | Zheng Zhoubei | 230 | 45.431 |
| 12 | Gorge nest | 230 | 37.891 |
| 13 | Xu Zhuan | 230 | 25.034 |
| 14 | Jin Dai | 230 | 37.529 |
| 15 | Blog article | 230 | 32.669 |
| 16 | Ring is emerald green | 230 | 36.405 |
| 17 | Osiery | 230 | 46.115 |
| 18 | Sky unit | 230 | 29.993 |
| 19 | Stone Buddhist | 230 | 42.085 |
| 20 | Jiang Zhai | 230 | 44.267 |
| 21 | Phoenix | 230 | 24.273 |
| 22 | Kind cloud | 230 | 39.439 |
| 23 | Fly | 230 | 45.087 |
| 24 | Longitude and latitude | 230 | 49.683 |
| 25 | Zheng Nan | 230 | 44.973 |
| 26 | Gongyi | 230 | 41.688 |
The result of calculation of table 9 shows, adopt Gongyi+Song Shan, Zhengzhou+force week+compartment model of longitude and latitude, although reduce the short-circuit current of In The South of Zhengzhou City part district 220kV bus.But it will be noted that longitude and latitude station 220kV busbar short-circuit electric current reaches 49.6kA, limit longitude and latitude station with 220kV rack development space, need at any time to take the measure of bus splitting with limiting short-circuit current.
Consider to take scheme (2): longitude and latitude station and south, existing Zhengzhou all do not exceed standard for district 220kV busbar short-circuit short circuit current electric current.Longitude and latitude station can keep the bus contact method of operation, joins after 220kV rack further develops, need according to the restriction of short-circuit current the connecting mode adjusting bus until it.The result of Comprehensive Correlation two schemes, the zoning scheme of scheme (2) is taked at longitude and latitude station, can keep development space and the access capability in its future.Therefore, recommend to take scheme (2), form a Ge Gong district by longitude and latitude station and Zheng Bei, port owned by the government.
According to the calculation of short-circuit current result of table 8, Gongyi, south, existing Zhengzhou, Song Shan, Zhengzhou, military all 220kV run as a Ge Gong district.Although short-circuit current does not all exceed standard, it is noted that the short-circuit current at the station such as Gongyi, gorge nest is more than 45kA, wherein station, Gongyi 220kV busbar short-circuit electric current is 47.4kA.In addition, Gongyi, Song Shan, Zhengzhou, military Zhou Zuowei mono-Ge Gong district, have 6 main transformers, be provided with the necessary condition of partition running.Therefore, Gongyi+Song Shan, Zhengzhou+force week can be considered respectively to run as a 220kV for district.Zhengzhou area 220kV aspect becomes 3 when the time comes independently for district, and its grid structure as shown in Figure 7.
To the independent grid structure for district in 3, Zhengzhou, take standard-sized sheet line, the mode of standard-sized sheet machine calculates short-circuit current, result is as shown in table 10.Result of calculation shows, the short-circuit current in Zhengzhou subregion (Song Shan+Gongyi), In The South of Zhengzhou City part district (Zhengzhou+force week) does not all exceed standard, and current result of calculation obtains under station, Song Shan 220kV bus closes female service condition, Song Shan can recover under standing in 220kV electrical network 3 district, Zhengzhou pattern to close female operation, is favourable to raising operational reliability.The port owned by the government 220kV busbar short-circuit electric current of northern subregion exceeds standard, then need the measure taking bus splitting.
Table 10 Zhengzhou 220kV electrical network divides the calculation of short-circuit current result in 3rd district
(3) phase III: optimizing and revising of 220kV electrical network 3 subregion inside
Zhengzhou area 220kV power network development be 3 independent of behind districts, its each for the 220kV rack of inside, district, also need to carry out suitable adjustment, to adapt to the development model of subregion.
To Zheng Bei+port owned by the government+longitude and latitude subregion, first will solve the problem that port owned by the government 220kV side section electric current exceeds standard, by port owned by the government 220kV bus splitting, electric network composition adjustment as shown in Figure 8.
After taking bus splitting measure, calculation of short-circuit current result is as shown in table 11.
Table 11 longitude and latitude becomes the calculation of short-circuit current result of two kinds of partition power supply plans
Result of calculation shows, port owned by the government 220kV busbar short-circuit levels of current obtains good restriction, meets the requirement of operation level.
The 220kV rack reinforcement measure in+Wu Zhougong district, Zhengzhou: according to existing programme, the year two thousand twenty Zhengzhou denominator+south, force week band Zhengzhou 220kV electrical network, but under the bus splitting mode of station, existing programme Zhengzhou, 220kV Geng He-blog article-Zhengzhou-Lu Hezhan only form 1 500kV contact become with Single-ring network, operational reliability is poor.Two kinds of reinforcement measures can be adopted: after 1 main transformer that the change of (1) Zhengzhou increases newly puts into operation, band 220kV Geng He-blog article-Zhengzhou-reed river looped network; (2) by former blog article-Jin Mount Tai double loop reconfiguration extremely clean cloud, become another main transformer with Zhengzhou and form from looped network.
The existing grid plan modification in Zhengzhou area can the needs of the following load development of basic guarantee, and the subject matter that electrical network faces is that 220kV busbar short-circuit electric current exceeds standard, and along with on the 500kV looped network of Zhengzhou, go into operation in Gongyi, longitude and latitude station, and Zheng Bei, the main transformer in military week put into operation.Zhengzhou area 220kV rack has possessed the condition of subregion stage by stage.Can carry out subregion arrangement to Zhengzhou 220kV electrical network step by step, outstanding feature feature has:
(1) along with Zheng Beizhan main transformer is gone into operation, Zhengzhou 220kV electrical network has possessed the condition being divided into two subregions in north and south, Song Shan+band Zhengzhou, Zhengzhou can be taked southern, western, and the compartment model of Zheng Bei+the north, band Zhengzhou, port owned by the government, east, solves the problem that existing short-circuit current exceeds standard;
(2) along with the development of south, Zhengzhou, western load, after going into operation in military all main transformers, Gongyi, longitude and latitude station, Zhengzhou 220kV electrical network Song Shan+Zhengzhou subregion has possessed the condition of subregion once again, In The South of Zhengzhou City part district can be expanded to Gongyi+Song Shan, Zhengzhou+military all subregions;
(3) process that in each subregion, 220kV rack develops in conjunction with subregion, need to carry out suitable adjustment and reinforcement measure, station, Song Shan 220kV bus can close female operation under 3 partitioned modes, with Geng He-blog article-Luzhou-Zhengzhou after the 3rd, Zhengzhou main transformer puts into operation from loop-net operation.
Step 3: investigation provincial power network integral load, power supply, rack development plan, assess the adaptability of passway for transmitting electricity between each city or group of cities, the main passway for transmitting electricity of analytical calculation determination provincial power network is strengthened or Optimized Adjustment Measures, realizes 500kV provincial power network (main grid structure) trend and transports flexibly and safe and reliable operation; The adaptive assessment of passway for transmitting electricity between each city or group of cities is carried out from static security and transient security two aspect:
(1) Static security assessment: after adopting PSD-BPA (i.e. PSD-ST) Load Flow Program computational analysis arbitrary time 500kV circuit or transformer non-fault N-1 to disconnect, whether there is other element overloads; If without other element overloads, then illustrate that passway for transmitting electricity static security meets the demands; If there is other element overloads, then adjust passway for transmitting electricity rack, until meet static security requirement;
(2) transient security assessment: after adopting PSD-BPA (i.e. PSD-ST) transient state program computation to analyze arbitrary time 500kV circuit or Three-Phase Transformer short circuit N-1 fault, whether cause destabilization problems; If there is not destabilization problems, then illustrate that passway for transmitting electricity transient security meets the demands; If there is destabilization problems, then adjust passway for transmitting electricity rack, until meet transient security requirement; Described destabilization problems is electrical network merit angle unstability, Voltage Instability or dynamic buckling.
The main passway for transmitting electricity of Henan Electric Power System to comprise in north-Henan, Henan in section, Yu Xi-Henan in section, Henan-south, Henan section, for section in west-Henan, Henan.In west-Henan, Henan, section connects Zhengzhou area 500kV looped network, along with the quick raising of Zhengzhou area at a specified future date load level, existing 500kV looped network is too tight, be faced with the difficult problem that short-circuit current controls, the possibility that following Zhengzhou area 500kV looped network expands improves day by day, connect passway for transmitting electricity in the west-Henan, Henan between Zhengzhou area, Foundation of Luoyang and there is certain inadaptability, be difficult to the requirement meeting ability to transmit electricity, short-circuit current controls.
500kV station of military week is in 500kV looped network south, Zhengzhou at present, and 500kV looped network can be extended to Wu Zhouzhan by future.For adapting to the change of the following southern expansion of Zhengzhou area 500kV looped network, suggestion: should first by all to force for single for passage Luo Dong in section in west-Henan, Henan-Zhengzhou loop line reconfiguration.500kV website calculation of short-circuit current result relevant after circuit reconfiguration is as shown in table 12.
Table 12 Luo Dong-Zhengzhou reconfiguration is to military all front/rear calculation of short-circuit current results
As shown in Table 12, Luo Dong-Zhengzhou reconfiguration is to Wu Zhouhou, and 500kV busbar short-circuit electric current of standing in military week slightly raises, and is 52.01kA.Station, Zhengzhou 500kV busbar short-circuit electric current reduces about 4kA, is 50.89kA.After reconfiguration, expand for Zhengzhou 500kV looped network south and provide precondition.The expansion scheme suggestion of Zhengzhou area 500kV looped network comprises following regulating measures: former Song Shan-Zhengzhou double back enlarging is Gongyi-Zhengzhou double back by (1); (2) Song Shan-longitude and latitude returns to out and goes here and there operating scheme, and Zhengzhou-longitude and latitude list returns and changes double back into and run; (3) Gongyi-Song Shan returns to out and goes here and there operating scheme, and Gongyi-single time, Song Shan changes double back into and runs.After above-mentioned adjustment ,-the dual-ring network of port owned by the government-longitude and latitude-Zhengzhou-Gongyi is changed by forming Gongyi-Song Shan-Zheng Bei-Zhengzhou in Zhengzhou.Zhengzhou area will be conducive to the needs adapting to following load growth after forming the looped network general layout expanded, and the dirigibility of the space that rack adjustment promotes and operation is obtained for raising.
Static security assessment is carried out to the Henan main grid structure after cross section regulation in west-Henan, Henan: adopt PSD-BPA Load Flow Program, computational analysis Henan Electric Power System arbitrary time 500kV circuit or transformer non-fault N-1 disconnect, result of calculation all can not cause other element overloads after showing to lose arbitrary element, therefore meets static security requirement to Henan main grid structure after cross section regulation in west-Henan, Henan.
Transient security assessment is carried out to the Henan main grid structure after cross section regulation in west-Henan, Henan: adopt PSD-BPA transient state program computation to analyze arbitrary time 500kV circuit or Three-Phase Transformer short circuit N-1 fault, result of calculation shows that arbitrary element occurs three and forever all can not cause system unstability after N-1 fault, therefore meets transient security requirement to Henan main grid structure after cross section regulation in west-Henan, Henan.
Step 4: the overall balance of electric power and ener situation of analytical calculation provincial power network, assessment provincial power network externally carrys out the capacity requirement of electric power, the external electric power of analytical calculation, with the adaptability of provincial power network under the different Transmission Mode such as extra-high-voltage alternating current, direct current, realizes the development of typical powering mode 1000/500kV electric network coordination;
(1) less if externally carry out electric power capacity requirement, can by existing provincial power network and outer net interconnection safe transport, then not consider to adopt other power supply modes;
(2) if some areas electrical network externally carrys out electric power capacity requirement and reaches 3000-5000MW in provincial power network, then consider to adopt ultra-high voltage AC transmission mode, and ensure that extra-high voltage and near region 500kV power network line and transformer three line short circuit N-1 fault all do not cause electrical network unstability, and without element overload;
(3) if some areas electrical network externally carrys out electric power capacity requirement and reaches 5000-8000MW in provincial power network, then consider to adopt extra-high voltage direct-current transmission mode, and ensure direct current drop point near region 500kV electrical network in normal, N-1, N-2 situation effectively short-circuit ratio all more than 2.5.
Carry out balance of electric power and ener to Henan Electric Power System entirety, the whole province's subregion power balance result is as follows:
[territory, North, Henan]
During system reserve 20%, the Henan overall electric power in north in 2015 slightly vacancy.Peace crane Pu area is NORTEL power vacancy region, Henan, 20% for subsequent use time electric power vacancy be 4313MW; Burnt new area is base, NORTEL source, Henan, 20% for subsequent use time electric power surplus be 3158MW.
Territory, North, Henan in 2018 electric power breach is enlarged to 1581MW, and peace crane Pu area electric power vacancy is 3299MW; Burnt new regional electric power surplus 1707MW.
The overall electric power vacancy 4462MW in north, the year two thousand twenty Henan, peace crane Pu area electric power vacancy is 4710MW; Burnt new regional electric power surplus 237MW.
Have above-mentioned analysis known, the peace crane Pu area of north Henan is respectively 4313MW (20% is for subsequent use), 3299MW and 4710MW in 2015,2018 and the year two thousand twenty electric power vacancy, meets ultra-high voltage AC transmission access way.
[in Henan region]
After in Henan, 20% system reserve is considered in region, within 2015, overall electric power vacancy is 4994MW, the western electric power surplus in Henan 545MW, and Zhengzhou electric power vacancy is 2308MW; Opening business's electric power vacancy is 3030MW.
In Henan in 2018, the overall electric power vacancy in region is 9092MW, the western electric power surplus in Henan 754MW, and Zhengzhou electric power vacancy is 4618MW; Opening business's electric power vacancy is 4939MW.
Region electric power vacancy more greatly 14772MW in the year two thousand twenty Henan, the western electric power in Henan transfers short 1780MW to by surplus, Zhengzhou and open business's electric power vacancy and all increase comparatively large, reaches 6538MW and 5793MW respectively.
Have above-mentioned analysis known, Zhengzhou area is respectively 2308MW (20% is for subsequent use), 4618MW and 6538MW in 2015,2018 and the year two thousand twenty electric power vacancy, meets extra-high voltage direct-current transmission access way; Open business area and to be respectively 3030MW (20% is for subsequent use), 4939 and 5793MW in 2015,2018 and the year two thousand twenty electric power vacancy, meet extra-high voltage direct-current transmission access way.
Consider his high voltage direct current transmission project of the Kazakhstan Zheng Zhiliu that put into operation, constantly can promote the ability to transmit electricity of DC transmission engineering to meet this ever-increasing electric power vacancy in two regions.
[south, Henan electrical network]
Within 2015, the overall vacancy in Yunan region is comparatively large, is 8475MW.Wherein tafelberg area electric power slightly surplus 943MW, is permitted Luo week electric power vacancy 4169MW, is stayed letter regional electric power vacancy 2293MW, Nanyang Prefecture electric power vacancy 3157MW.
The overall electric power vacancy 14315MW in Yunan region in 2018.Tafelberg electric power slightly vacancy is 590MW, is permitted Luo week, all has larger electric power vacancy in letter, Nanyang Prefecture, reach 5190MW, 3833MW and 4957MW respectively.
The year two thousand twenty Yunan region electric power vacancy 16181MW.Tafelberg electric power is in a basic balance, and being permitted Luo week electric power vacancy is 6056MW, and the vacancy of electric power in letter is 5150MW, Nanyang electric power vacancy 5219MW.
There is above-mentioned analysis known, permitted Luo week area and be respectively 4169MW (20% is for subsequent use), 5190MW and 6056MW in 2015,2018 and the year two thousand twenty electric power vacancy, meet extra-high voltage direct-current transmission access way;
Area in letter is respectively 2293MW (20% is for subsequent use), 3833MW and 5150MW in 2015,2018 and the year two thousand twenty electric power vacancy, meets extra-high voltage direct-current transmission access way;
Nanyang Prefecture is respectively 3157MW (20% is for subsequent use), 4957MW and 5219MW in 2015,2018 and the year two thousand twenty electric power vacancy, meets extra-high voltage direct-current transmission access way.
Consider the existing extra-high-voltage alternating current demonstration project in Nanyang Prefecture, suitably can alleviate the electric power vacancy of Nanyang Prefecture.From economic aspect consider, need to make full use of built extra-high-voltage alternating current demonstration project, extra-high voltage demonstration project therefore can be considered to extend, with meet Nanyang Prefecture for electric power vacancy.
Permitted Luo week area and stayed to believe that regional geographic position is close, electrical link is tight, and all meet the access conditions of extra-high voltage direct-current engineering, but consider his high voltage direct current transmission project of the Kazakhstan Zheng Zhiliu that put into operation, if build another Large Copacity extra-high voltage direct-current transmission engineering again in Henan Province, existing rack short-circuit ratio index under system N-1, N-2 fault perhaps cannot meet.Therefore can consider permitted Luo week area with area in letter build extra-high voltage alternating current-direct current series-parallel connection power transmission engineering, both these two regional electric power vacancy were met by extra-high voltage direct-current transmission engineering, increased again the short-circuit ratio of system by extra-high-voltage alternating current and transmission project thereof, meet under system is nonserviceabled and must ask for short-circuit ratio index.
Step 5: according to the result in step 2, three, four, forms provincial power network layering and zoning grid structure planning suggested design.
By to Henan Electric Power System city/group of cities 500/220kV electrical network, the key power transmission network of 500kV, 1000/500kV electrical network and the adaptive multianalysis of extra-high voltage direct-current drop point and assessment, Henan Electric Power System layering and zoning target net is proposed as follows:
1, under condition is put into operation at north, extra-high voltage Henan 4*3000MVA, Nanyang 3*3000MVA, Zhumadian 2*4500MVA tri-station, Henan Electric Power System should open Henan, Hubei Province section 1000/500kV electromagnetic looped network, realizes the general layout run by three ultra-high voltage transformer station band Henan Electric Power System; Good short-circuit current can be realized under this general layout control and safe and stable operation.
2, the provincial 500kV bulk transmission grid in Henan can keep " two vertical four is horizontal " pattern, and with the city 500kV dual-ring network around Zhengzhou for core, progressively the central Henan area 500kV dual-ring network connecting Foundation of Luoyang is entered to be formed in west; With this dual-ring network for core, send by electric channel respectively to the north, western part, east, southern areas radiation 500kV, form the key electrical network of provincial 500kV connecting Henan Electric Power System Western Energy Resources base and middle part, the north, east, southern load center.By the adjustment to the relevant 500kV circuit in area, tafelberg, eliminate original overline structure, form north and south, East and West direction passway for transmitting electricity respectively, form Southwest Henan and the southeast, Henan 500kV power transmission passage comparatively clearly.
3, take Zhengzhou area as the first kind urban distribution network of representative, the 500kV dual-ring network around city should be built, form the 500/220kV electrical network of districting operation, plan is formed respectively with the 500/220kV local transmission network that 500kV Gongyi-Song Shan, Zheng Bei-port owned by the government-longitude and latitude, Zhengzhou-Zheng Nan are core; Foundation of Luoyang can rely on self structure to form triangle 500kV looped network, promotes power supply reliability.
4, with Xinxiang, tafelberg, Nanyang for representing Equations of The Second Kind urban distribution network, the key passway for transmitting electricity of Henan Electric Power System should be relied on first to form chain type 500kV electrical network, realize this area 500/220kV electromagnetic looped network and run, unlink with other ground utility grids and run; If load growth is rapid, can plan that newly-built 500kV transformer station progressively forms the 500kV looped network around urban electricity supply scope, the front Nanyang Prefecture of the year two thousand twenty can begin to take shape the triangle 500kV looped network around city.
5, with the 3rd class urban distribution network that Hebi, Zhumadian are representative, should form 500kV ring network structure with contiguous urban distribution network, can 500/220kV electromagnetic looped network between appropriateness reservation different cities for strengthening power supply reliability; Along with load growth, the key electrical network of provincial 500kV can be relied on to send powered direction to plan newly-built 500kV transformer station, realize chain type 500kV electrical network, untie intercity 500/220kV electromagnetic looped network with other, to improve power supply reliability and to reduce power supply distance, Improve Efficiency.
First planing method in this example by the clearly each city of balance of electric power and ener or group of cities power network development target and typical powering mode, then assesses the adaptability of passway for transmitting electricity between each city/group of cities, builds the key power transmission network of provincial power network 500kV; Last according to external electricity needs, formulate 1000/500kV electric network coordination development strategy; Thus build the 1000/500/220kV provincial power network layering and zoning coordinated planning scheme of city/group of cities power supply network, the key passway for transmitting electricity of 500kV province net, extra-high voltage alternating current-direct current drop point three grades coordination.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a provincial power network layering and zoning typical case powering mode planing method, is characterized in that, said method comprising the steps of:
Step one: the power demands evaluation index calculating each city or group of cities electrical network, and carry out the classification of urban distribution network developing goal;
Step 2: the typical powering mode assessing each city or group of cities electrical network;
Step 3: the adaptability assessing passway for transmitting electricity between each city or group of cities;
Step 4: assessment provincial power network externally carrys out the capacity requirement of electric power, and judges whether to take other power supply modes according to described capacity requirement;
Step 5: according to step 2, three, the result of four, form provincial power network layering and zoning typical case's powering mode planning suggested design.
2. a kind of provincial power network layering and zoning according to claim 1 typical case's powering mode planing method, it is characterized in that, in described step one, the computing formula of the power demands evaluation index of each city or group of cities electrical network is:
Wherein, L
ibe the bulk supply need assessment index of i-th urban distribution network, P
cibe the supply load capacity of i-th urban distribution network, P
cmaxfor the maximum supply load capacity in each urban distribution network, V
cibe the supply load scale factor of i-th urban distribution network, P
dibe the supply load density of i-th urban distribution network, P
dmaxfor the maximum supply load density in each urban distribution network, V
dibe the supply load density factor of i-th urban distribution network, i is urban distribution network quantity in provincial power network, i=1,2 ..., N-1, N.
3. a kind of provincial power network layering and zoning according to claim 1 typical case's powering mode planing method, it is characterized in that, in described step one, the classification of urban distribution network developing goal is the power demands evaluation index L with reference to each city or group of cities electrical network
isize is carried out, and concrete grammar is:
As 0.45≤L
iwhen≤1, be judged as the whole province key city, urban distribution network developing goal is build the 500kV looped network around city, and realizes 220kV sub area division districting operation;
As 0.25≤L
iduring <0.45, be judged as regional hub city, urban distribution network developing goal economizes net key passage formation chain type 500kV electrical network for relying on, and realizes this area 220kV sub area division districting operation, unlinks run with other ground utility grids;
As 0≤L
iduring <0.25, be judged as underdeveloped urban, urban distribution network developing goal is form 500kV looped network with contiguous urban distribution network, and the 500/220kV electromagnetic looped network retained between different cities runs.
4. a kind of provincial power network layering and zoning according to claim 1 typical case's powering mode planing method, is characterized in that, in described step 2, assesses each city or group of cities electrical network typical case powering mode comprises: short circuit current level assessment and evaluation of power supply capability.
5. a kind of provincial power network layering and zoning according to claim 4 typical case's powering mode planing method, is characterized in that,
Described short circuit current level appraisal procedure is: adopt PSD-SCCPC or PSD-SCCP short-circuit current program computation to go out each 500kV and 220kV busbar short-circuit current values size, and preset short-circuit current Numerical Control target; If the short-circuit current numerical value of 500kV and 220kV bus all meets control objectives, then illustrate that typical powering mode meets the demands; If control objectives can not be met, then adjust typical powering mode, until meet control objectives;
Described evaluation of power supply capability method is: adopt PSD-FDS full dynamic simulation program computation to obtain each city or group of cities mains supply capacity of water, and compare with each city or group of cities mains supply capacity requirement; If power supply capacity size meets each city or group of cities mains supply capacity requirement, then the scheme selecting power supply capacity maximum is as typical powering mode; If do not meet, then adjust typical powering mode, until meet city or group of cities mains supply capacity requirement.
6. a kind of provincial power network layering and zoning according to claim 1 typical case's powering mode planing method, is characterized in that, in described step 3, assess passway for transmitting electricity adaptability between each city or group of cities and comprise: Static security assessment and transient security assessment.
7. a kind of provincial power network layering and zoning according to claim 6 typical case's powering mode planing method, is characterized in that,
Described Static security assessment method is: after adopting PSD-BPA Load Flow Program computational analysis arbitrary time 500kV circuit or transformer non-fault N-1 to disconnect, whether there is other element overloads; If without other element overloads, then illustrate that passway for transmitting electricity static security meets the demands; If there is other element overloads, then adjust passway for transmitting electricity rack, until meet static security requirement;
Described transient security appraisal procedure is: after adopting PSD-BPA transient state program computation to analyze arbitrary time 500kV circuit or Three-Phase Transformer short circuit N-1 fault, whether cause destabilization problems; If there is not destabilization problems, then illustrate that passway for transmitting electricity transient security meets the demands; If there is destabilization problems, then adjust passway for transmitting electricity rack, until meet transient security requirement; Described destabilization problems is electrical network merit angle unstability, Voltage Instability or dynamic buckling.
8. a kind of provincial power network layering and zoning according to claim 1 typical case's powering mode planing method, it is characterized in that, the concrete grammar of described step 4 is:
If the capacity requirement that provincial power network externally carrys out electrical network reaches preset value, then by existing provincial power network and outer net interconnection safe transport, do not consider to adopt other power supply modes;
If the capacity requirement that provincial power network externally carrys out electrical network reaches preset value, then consider to adopt in extra-high-voltage alternating current or extra-high voltage direct-current transmission mode, and analyze further the adaptability of external electric power at extra-high-voltage alternating current or extra-high voltage direct-current transmission mode provincial power network.
9. a kind of provincial power network layering and zoning according to claim 8 typical case's powering mode planing method, is characterized in that,
If some areas electrical network externally carrys out electric power capacity requirement and is less than 3000MW in provincial power network, then by existing provincial power network and outer net interconnection safe transport, do not consider to adopt other power supply modes;
If some areas electrical network externally carrys out electric power capacity requirement and reaches 3000-5000MW in provincial power network, then consider to adopt ultra-high voltage AC transmission mode, and ensure that 500kV power network line and Three-Phase Transformer short circuit N-1 fault all do not cause electrical network unstability, and without element overload;
If some areas electrical network externally carrys out electric power capacity requirement and reaches 5000-8000MW in provincial power network, then consider to adopt extra-high voltage direct-current transmission mode, and ensure the 500kV electrical network of direct current drop point under normal, N-1 fault and N-2 failure condition effectively short-circuit ratio all more than 2.5.
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| CN113922409B (en) * | 2021-10-19 | 2024-03-22 | 国网江苏省电力有限公司 | Constant volume method for urban power grid multi-partition flexible interconnection converter station |
| CN114142462A (en) * | 2021-11-24 | 2022-03-04 | 国网湖南省电力有限公司 | Power grid layered partitioning scheme optimization method |
| CN114142462B (en) * | 2021-11-24 | 2022-12-09 | 国网湖南省电力有限公司 | Power grid layered partitioning scheme optimization method |
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