CN110197322A - A kind of evaluation method, system and the storage medium of the cyclization of electromagnetic looped network solution - Google Patents
A kind of evaluation method, system and the storage medium of the cyclization of electromagnetic looped network solution Download PDFInfo
- Publication number
- CN110197322A CN110197322A CN201910388143.7A CN201910388143A CN110197322A CN 110197322 A CN110197322 A CN 110197322A CN 201910388143 A CN201910388143 A CN 201910388143A CN 110197322 A CN110197322 A CN 110197322A
- Authority
- CN
- China
- Prior art keywords
- evaluation
- electromagnetic
- index
- ring network
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011156 evaluation Methods 0.000 title claims abstract description 219
- 238000003860 storage Methods 0.000 title claims abstract description 19
- 238000007363 ring formation reaction Methods 0.000 title abstract 4
- 238000000034 method Methods 0.000 claims abstract description 70
- 238000004364 calculation method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000001052 transient effect Effects 0.000 claims description 34
- 230000003068 static effect Effects 0.000 claims description 31
- 238000007142 ring opening reaction Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 abstract description 5
- 238000013210 evaluation model Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 8
- 238000007726 management method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004445 quantitative analysis Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
- G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/80—Management or planning
- Y02P90/82—Energy audits or management systems therefor
Landscapes
- Business, Economics & Management (AREA)
- Human Resources & Organizations (AREA)
- Engineering & Computer Science (AREA)
- Economics (AREA)
- Strategic Management (AREA)
- Theoretical Computer Science (AREA)
- Entrepreneurship & Innovation (AREA)
- Educational Administration (AREA)
- Marketing (AREA)
- Development Economics (AREA)
- Health & Medical Sciences (AREA)
- Tourism & Hospitality (AREA)
- Physics & Mathematics (AREA)
- General Business, Economics & Management (AREA)
- General Physics & Mathematics (AREA)
- Public Health (AREA)
- Primary Health Care (AREA)
- Water Supply & Treatment (AREA)
- General Health & Medical Sciences (AREA)
- Game Theory and Decision Science (AREA)
- Operations Research (AREA)
- Quality & Reliability (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of evaluation methods of electromagnetic looped network solution cyclization, system and storage medium, establish the appraisement system of perfect evaluation electromagnetic looped network solution Electromagnetic coupling mode, the value of each evaluation index in Calculation Estimation system, use analytic hierarchy process (AHP) method, obtain the weight of each analysis level in appraisement system, the weight for each evaluation index that each analysis level includes is obtained using entropy assessment, according to the value of each evaluation index, the weight of each analysis level, the weight of each evaluation index, the comprehensive evaluation value before and after electromagnetic looped network unlinks is calculated using electromagnetic looped network comprehensive energy efficiency evaluation model, comprehensive evaluation value before and after being unlinked by comparison electromagnetic looped network, determine whether electromagnetic looped network needs to unlink；The present invention constructs the appraisement system of perfect evaluation electromagnetic looped network solution cyclization, provides a kind of method of evaluation electromagnetic looped network solution cyclization simple, accuracy is high.
Description
Technical Field
The invention relates to an evaluation method, a system and a storage medium for an electromagnetic looped network open-close loop, and belongs to the technical field of power systems.
Background
Because of reasons such as energy utilization and pollution control, the power is generally far away from the load center, this needs long-distance large-capacity transmission electric energy, in order to obtain bigger transmission power, reduce the transmission loss of network, need adopt the higher voltage level electric wire netting to transmit, adopt the electric wire netting of higher level voltage to transmit, brought the benefit of seeing and hearing for the electric wire netting in a certain period, but also formed the electromagnetism looped netowrk simultaneously, along with the continuous development of electric wire netting structure, the negative effects of electromagnetism looped netowrk operation can constantly expose. In the electromagnetic ring network, once the high-voltage line is disconnected due to a fault, the connection impedance between systems is suddenly and obviously increased, so that the transient stability limit of the connection line is extremely easily exceeded, system oscillation is possible to occur, the electromagnetic ring network can make a safety and stability device complex, the matching difficulty is high, and the protection and safety automatic device is complex and not matched, which is generally the direct or enlarged reason of an accident. Because accidents caused by the problems of the electromagnetic looped network frequently occur and cause great economic loss, the performance of the power grid in all aspects is comprehensively considered under the operation mode of the electromagnetic looped network, and the judgment of whether the electromagnetic looped network needs to be operated in an open loop mode becomes a great problem to be solved urgently in the power supply network, so that the method for evaluating the operation of the open loop and the closed loop of the electromagnetic looped network is necessary.
Disclosure of Invention
The present invention provides a method, a system and a storage medium for evaluating an open loop of an electromagnetic ring network, so as to solve one of the above drawbacks or defects in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a method for evaluating an open loop of an electromagnetic ring network, the method comprising the following steps:
an evaluation system for evaluating the operation mode of the electromagnetic looped network open-close loop is constructed, wherein the evaluation system comprises l evaluation levels, and the l evaluation levels comprise m evaluation indexes;
calculating values of evaluation indexes before and after the ring is broken of the electromagnetic ring network;
obtaining the weight of each evaluation level before and after the ring is broken of the electromagnetic looped network according to the analytic hierarchy process and the value of each evaluation index; according to the value of each evaluation index, calculating the weight of each evaluation index before and after the electromagnetic looped network is broken by using an entropy weight method;
and calculating comprehensive evaluation values before and after the ring is broken of the electromagnetic ring network according to the values of the evaluation indexes before and after the ring is broken of the electromagnetic ring network, the weights of the evaluation levels before and after the ring is broken of the electromagnetic ring network and the weights of the evaluation indexes before and after the ring is broken of the electromagnetic ring network, and judging the operation scheme of the ring is broken and closed of the electromagnetic ring network.
The method for judging the operation scheme of the electromagnetic looped network open-close loop comprises the following steps: comparing the comprehensive evaluation values before and after the ring is separated from the electromagnetic ring network, and selecting an operation mode that the electromagnetic ring network is not separated if the comprehensive evaluation value before the ring is separated from the electromagnetic ring network is larger than the comprehensive evaluation value after the ring is separated; otherwise, selecting the operation mode of ring opening of the electromagnetic ring network.
The evaluation indexes include: static stability margin index, transient stability margin index, thermal stability margin index, safety control quantity index, operation control difficulty index, switch equipment investment index and short-circuit current index.
The evaluation levels comprise static stability safety, transient stability safety, thermal stability safety, safety and stability control and operation economy.
The calculation formula of the static stability margin index is as follows:
wherein, KpsRepresenting the static stability margin after an N-1 accident; pZRepresenting the normal mode of transporting the tidal current; pjsRepresenting the post-accident static stability limit;
the transient stability margin index is calculated according to the following formula:
wherein, KmRepresents a transient stability margin indicator, PjmRepresenting the transient stability limit of the outgoing section;
the calculation formula of the thermal stability margin index is as follows:
wherein, KpnRepresents the thermal stability margin; pjnThe thermal stability limit of the high-voltage grade line after the N-1 accident is represented;
the calculation formula of the safety control quantity index mu is as follows:
wherein, Δ pzRepresenting the final safety control machine cutting amount;
the operation control difficulty index sigma is as follows:
the calculation formula of the switchgear investment index W is as follows:
W＝∑wk(Ikmax/Ik)2M
wherein, wkA weight factor representing the bus k; i iskIndicating that bus k is three-phase shortA path current; i iskmaxRepresents the maximum breaking current of the switchgear, M being a positive real number, usually taken as 1;
the short-circuit current index is calculated by the following formula:
wherein, KIDenotes the short-circuit current index, kIhShowing the short-circuit current margin of the h-th station on both sides of the power transmission section, ImaxhRepresents the h-th station short-circuit current interruption capacity, IshThe short-circuit current of the h-th station is shown, and n is the number of lines of the station.
The calculation formula for acquiring the weight of each evaluation level by the short-circuit current index station is as follows:
wherein, wsThe weight representing the s-th evaluation level,
wherein,score representing the s-th level, asyAnd a judgment value representing the s-th rating level with respect to the y-th rating level obtained from the analytic hierarchy process and the values of the evaluation indexes.
The formula for calculating the weight of each evaluation index is as follows:
wherein q isjThe weight of the jth evaluation index; gjIndicates the value of the jth evaluation index.
The calculation formula for calculating the comprehensive evaluation value before and after the ring is broken of the electromagnetic looped network is as follows:
wherein g represents the comprehensive evaluation value of the electromagnetic looped network, PsWeight representing the s-th evaluation level, qsjWeight, x, representing the jth evaluation index contained in the s-th evaluation hierarchysjAnd a value indicating the j-th evaluation index included in the s-th evaluation hierarchy.
In a second aspect, the present invention provides an evaluation system for an electromagnetic ring network loop-opening and closing loop, the system including:
constructing a module: an evaluation system for evaluating the operation mode of the electromagnetic looped network open-close loop is constructed, wherein the evaluation system comprises l evaluation levels, and the l evaluation levels comprise m evaluation indexes;
a first calculation module: the method is used for calculating the values of evaluation indexes before and after the ring is broken of the electromagnetic ring network;
a first obtaining module: the method is used for obtaining the weight of each evaluation level before and after the ring is broken down of the electromagnetic ring network according to the analytic hierarchy process and the value of each evaluation index;
a second calculation module: the method is used for calculating the weight of each evaluation index before and after the ring is broken by the electromagnetic ring network by using an entropy weight method according to the value of each evaluation index;
a third calculation module: the method is used for calculating the comprehensive evaluation values before and after the electromagnetic ring network is looped off according to the values of the evaluation indexes before and after the electromagnetic ring network is looped off, the weights of the evaluation levels before and after the electromagnetic ring network is looped off and the weights of the evaluation indexes before and after the electromagnetic ring network is looped off, and judging the operation scheme of the electromagnetic ring network looped off.
The system further comprises a judging module for comparing the comprehensive evaluation values before and after the ring is broken of the electromagnetic ring network, and selecting the operation mode that the electromagnetic ring network is not broken if the comprehensive evaluation value before the ring is broken is larger than the comprehensive evaluation value after the ring is broken; otherwise, selecting the operation mode of ring opening of the electromagnetic ring network.
In a third aspect, the present invention further provides an evaluation system for an electromagnetic ring network loop-opening and loop-closing, comprising a processor and a storage medium; it is characterized in that the preparation method is characterized in that,
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the aforementioned method.
In a fourth aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the aforementioned method.
The invention provides an evaluation method, a system and a storage medium for an electromagnetic looped network open-close loop, which are used for evaluating the electromagnetic looped network open-close loop by establishing a perfect evaluation system for evaluating the electromagnetic looped network open-close loop, using a hierarchical analysis method to obtain the weight of each evaluation level in the evaluation level, obtaining the weight of each evaluation index contained in each evaluation level by an entropy weight method, calculating the comprehensive evaluation value before and after the electromagnetic looped network open-loop through an electromagnetic looped network comprehensive energy efficiency evaluation model, and obtaining a method for evaluating the electromagnetic looped network combined loop by comparing the comprehensive evaluation values before and after the electromagnetic looped network open-loop; the invention provides a method for evaluating the electromagnetic looped network open-close loop through quantitative analysis, which has important significance for evaluating the electromagnetic looped network open-close loop.
Drawings
FIG. 1 is a schematic structural diagram of an evaluation system for an electromagnetic looped network open loop provided in an embodiment of the present invention;
fig. 2 is a flowchart of an evaluation method for an electromagnetic ring network disconnecting and closing ring according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 2, the embodiment provides an evaluation method for an electromagnetic ring network disconnecting/closing ring, which includes the following steps:
step 1: an evaluation system for evaluating an electromagnetic looped network open-close loop mode is built, wherein the evaluation system comprises l evaluation levels, and the l evaluation levels comprise m evaluation indexes;
referring to fig. 1, in one example, the constructed evaluation system comprises 5 evaluation levels of static stability safety, transient stability safety, thermal stability safety, safety and stability control and operation economy;
the 5 levels comprise 7 evaluation indexes: the static stability safety comprises a static stability margin index; the transient stability safety comprises a transient stability margin index; the thermal stability safety comprises a thermal stability margin index; the safety and stability control comprises a safety control quantity index and an operation control difficulty index; the operation economy comprises switch equipment investment indexes and short-circuit current indexes.
Step 2: calculating the values of evaluation indexes before and after the ring is broken of the electromagnetic looped network:
step 2.1: calculating a static stability margin index:
the static stability is used for representing the capability of automatically recovering to the initial running state without aperiodic step loss after the power system is subjected to small disturbance.
Transmission of electricityThe static stability limit of the section is closely related to the power transmission distance of the connecting line and the strength of a transmitting and receiving end system, and the static stability after an N-1 accident can represent the strength of a system net rack; establishing a static stability margin index after N-1 accident after ring opening as one of the criterion indexes of ring opening and calculating a static stability margin index KpsThe calculation formula of (a) is as follows:
wherein, KpsRepresenting the static stability margin after an N-1 accident; pZDelivering tidal current in a normal manner; pjsIn order to be the static stability limit after an accident,
step 2.2: calculating a transient stability margin index:
the transient stability limit is an important factor for restricting the sending capacity, when the N-1 fault occurs in the power grid, in order to ensure that the system does not lose step after the fault, the section transportation power flow in a normal mode needs to be controlled within the transient stability limit, the transient stability margin index represents the transient stability of the system, and the transient stability margin index KmThe calculation formula of (a) is as follows:
wherein, KmRepresents a transient stability margin indicator, PzRepresenting the flow of power in the normal mode, PjmIs the temporary stability limit of the delivery section;
Kmthe larger the transient stability margin is, and the more stable the system is, under the condition that the normal mode outgoing section flow is the same.
Step 2.3: calculating a thermal stability margin index:
for the electromagnetic ring network, under normal conditions, the connection impedance between the systems on the two sides is slightly smaller than the impedance of a high-voltage line, and after the high-voltage line is disconnected due to a fault, the transmission power is transferred to a low-voltage-level line, so that the line is overloaded, and even possibly exceeds the thermal stability limit of the line, and further the section conveying capacity is restricted;
the calculation formula of the thermal stability margin is as follows:
wherein, KpnAs an indicator of thermal stability, PzDelivering tidal current in a normal manner; pjnThe thermal stability limit after the N-1 accident of the high-voltage grade line is obtained.
At PzUnder the premise of no change, KpnThe larger the value is, the higher the thermal stability limit of the channel is, and the electromagnetic looped network can not be broken; kpnThe smaller the value, the greater the necessity for the electromagnetic ring network to be unlinked.
Step 2.4: calculating a safety control quantity index:
under the high voltage level line loss channel fault of the electromagnetic ring network, the electrical distance between the systems at two ends is greatly increased, the stability level of the system is greatly reduced, transient stability accidents or dynamic stability accidents can be caused, and at the moment, the system security control device acts to cut off a sending end unit, so that the active power of a receiving end system is unbalanced.
By using Δ PzTransporting tidal current P in a normal mannerzEstablishing a safety control quantity evaluation index, wherein a calculation formula of a safety control quantity index mu is as follows:
wherein Δ pzThe final machine cutting amount is regulated and controlled; the safety control quantity index mu represents the proportion of the required safety control quantity to the pre-accident current under the serious fault of the system; safety control measuring fingerWhen the mark is smaller, the overload tide is larger after the accident, and then the cutting amount is more, and the loop disconnection necessity of the electromagnetic looped network is high; the larger the safety control quantity index is, the smaller the overheating or overheating stabilizing trend is shown after the accident is, and the electromagnetic looped network can not be disconnected.
Step 2.5: operation control difficulty index:
besides the safety and stability of the power system, the operation management difficulty is also a problem to be considered for the ring-opening of the electromagnetic ring network. In order to realize the layered and partitioned operation of the power grid, facilitate the systematic layered and partitioned management, reduce the working pressure of dispatching management personnel and simplify the setting of the relay protection device, the high-voltage-class power grid and the low-voltage-class power grid in China may belong to different-level dispatching departments for management, at the moment, the high-voltage-class regulation and control center management personnel cannot directly obtain the low-voltage-class line tide in real time, and the direct control of the section tide of the electromagnetic ring network is difficult, so the dispatching control difficulty of the operation of the electromagnetic ring network is considered when the loop-disconnecting necessity of the electromagnetic ring network is evaluated. Defining a grid operation management difficulty index sigma as follows:
if the high-voltage and low-voltage grade circuits of the electromagnetic ring network belong to the jurisdiction of the first-level dispatching department, the electromagnetic ring network can be operated in a loop closing mode, and otherwise, the electromagnetic ring network is preferably operated in a loop opening mode.
Step 2.6: calculating investment indexes of the switch equipment:
the calculation formula of the switchgear investment index W is as follows:
W＝∑wk(Ikmax/Ik)2M (5)
wherein, wkIs the weight factor for bus k; i iskIs bus k three-phase short circuit current; i iskmaxIs the maximum interruption current of the switchgear, M being a positive real number, usually taken as 1.
Step 2.7: calculating a short-circuit current index:
the short-circuit current of the power system mainly depends on the installed scale and the structure of a power grid, the installed capacity of a power supply of a sending end system is large, and the short-circuit current of a dense access point of the power supply is high. Under the operation condition of closing a loop of an electromagnetic looped network, the short-circuit current is easy to exceed the standard, the loop disconnection of the electromagnetic looped network is required to be considered when the short-circuit current exceeds the standard, whether the loop disconnection of the electromagnetic looped network is required to be evaluated under the condition that the short-circuit current does not exceed the standard or not, the short-circuit current index is required to be considered, and the short-circuit current index is defined as follows:
wherein, KIDenotes the short-circuit current index, kIhFor short-circuit current margin of the h-th station on both sides of the power transmission section, ImaxhFor the station short-circuit current interruption capacity, IshIs the short circuit current of the station. The larger the short-circuit current margin is, the lower the risk that the short-circuit current exceeds the standard is, the safer the system is, and n represents the number of lines of a plant station.
PSD-BPA electromechanical transient simulation software is adopted, and the Shanxi extra-high voltage grid structure is taken as an example to verify the correctness of the method. The Shanxi electric network supplies power to the North China main network through a 500kV connecting line consisting of Datong-Liang mountain, Shendi-Bao north, Lucheng-Xin an and Yangquan-Guishan mountain, extra-high voltage stations in North Shanxi and Shanzhong and Shijiazhuang are connected with a 500kV electric network in Shanxi land and in Shanxi in future 2-3 years, and the 1000/500kV electromagnetic ring network is formed by the two extra-high voltage transmission channels in North Shanxi, Beijing West and Jinzhong and Shijiazhuang and the 500kV discharge channel in Shanxi. And (3) considering two operation schemes of ring opening and ring closing aiming at the Shanxi delivery system, and evaluating whether the extra-high voltage channel and the 500kV connecting line are opened or not.
Referring to the above calculation method of each evaluation index, the values of each evaluation index before and after the ring is broken by the electromagnetic ring network calculated by using BPA are shown in table 1:
TABLE 1
| Evaluation index number | Evaluation index | Not to be separated when falling to the ground | Floor type full solution |
| 1 | Static stability margin | 0.563 | 0.25 |
| 2 | Transient stability margin | 0.426 | 0.206 |
| 3 | Thermal stability margin | 0.031 | 0.012 |
| 4 | Safety control quantity index | 10 | 1.647 |
| 5 | The operation is difficult to controlDegree of rotation | 1 | 1 |
| 6 | Investment in switchgear | 0.564 | 0.357 |
| 7 | Index of short circuit current | 0.117 | 0.245 |
And step 3: obtaining the weight of each evaluation level before and after the ring is broken of the electromagnetic looped network according to an analytic hierarchy process:
and determining the subjective weight of each evaluation level by adopting an analytic hierarchy process for the evaluation levels of the index system. The method adopts the basic process of determining the weight of each evaluation level by using an analytic hierarchy process to establish a hierarchical structure of the system.
The key of obtaining the weight value by using the analytic hierarchy process is to establish a judgment matrix for pairwise comparison, then solve the maximum characteristic value and the characteristic vector of the judgment matrix and finally determine the index weight. Establishing a judgment matrix A ═ asyThe assignment rule is:
if the judgment value of comparing the s-th evaluation level with the y-th evaluation level is asyIf the judgment value of the comparison between the y-th evaluation level and the s-th evaluation level is:
wherein, ass＝1。
Solving the maximum eigenvalue lambda of the judgment matrix AmaxThe corresponding normalized feature vector, i.e. the weight of the evaluation level:
the form of decision matrix a is as follows:
calculating the weight of each evaluation level, and calculating the weight w of the s-th evaluation levelsThe calculation formula of (2) is as follows:
wherein,the score of the s-th level is represented by the formula:
wherein, asyAnd a judgment value representing the s-th rating level with respect to the y-th rating level obtained from the analytic hierarchy process and the values of the evaluation indexes.
Taking the falling-to-ground non-ring-off as an example to obtain a judgment matrix of evaluation levels, comparing five levels according to the data of each evaluation index shown in table 1 in the order of static stability, transient stability, thermal stability, safety and stability control and operation economy, and obtaining the judgment matrix for judging the importance of each level under the condition of falling-to-ground non-ring-off as follows:
the evaluation index importance comparison scale in the judgment matrix a is as follows:
TABLE 2
| Relative degree of importance | Definition of |
| 1 | Comparison of the former and latter two, both of which are equally important |
| 3 | The former is slightly more important than the latter in comparison of the former and the latter |
| 5 | The former is more important than the latter in comparison with the former |
| 7 | The former is significantly more important than the latter in comparison with the former |
| 9 | Comparing the former with the latter, the former being absolutely more important than the latter |
| 2,4,6,8 | Between two important levels |
The evaluation hierarchy weights calculated according to the formulas (8), (9) and (10) are shown in the following table:
TABLE 3
| Evaluation level number | 1 | 2 | 3 | 4 | 5 |
| Hierarchy of evaluations | Static stability safety | Transient stability safety | Safety of thermal stability | Safety and stability control | Economy of operation |
| Weight of | 0.17 | 0.25 | 0.2 | 0.28 | 0.1 |
And 4, step 4: calculating the weight of each evaluation index before and after the ring is broken by the electromagnetic ring network by using an entropy weight method;
the weight of each evaluation index is obtained by using an entropy weight method, and when the entropy value of a certain evaluation index is small, it indicates that the variation rate of the evaluation index is high, and the weight of the evaluation index is large because the evaluation index has a large influence on the overall evaluation index result.
Calculating the characteristic specific gravity t of the jth evaluation indexjThe formula of (1) is:
wherein x isjReferring to the value of the j-th evaluation index in the electromagnetic ring network landing non-ring-off operation mode shown in table 1: referring to Table 1, x1、x2、x3、x4、x5、x6、x7Respectively representing the value of a static stability margin index, the value of a transient stability margin index, the value of a thermal stability margin index, the value of a safety control quantity index, the value of an operation control difficulty index, the value of a switch equipment investment index and the value of a short-circuit current index in a landing non-loop-off operation mode of the electromagnetic looped network.
Calculating the j evaluation index entropy value ejIs calculated by the formula
Wherein the coefficientsAnd 0 < ej＜1。
Calculating the difference coefficient g of the jth evaluation indexjThe calculation formula of (2) is as follows:
gj＝1-ej (13)
calculating the jth evaluation index weight value qjThe calculation formula of (a) is as follows:
according to table 1 and equations (11) to (14), the weights of the evaluation indexes in the electromagnetic ring network landing non-ring-off operation mode calculated by the entropy weight method are obtained as shown in the following table:
TABLE 4
| Evaluation index | Index entropy value | Index difference coefficient | Evaluation index weight |
| Static stability margin | 0.0280 | 0.9720 | 0.20 |
| Transient stability margin | 0.1170 | 0.8830 | 0.17 |
| Index of short circuit current | 0.1265 | 0.8735 | 0.16 |
| Thermal stability margin | 0.1874 | 0.8126 | 0.15 |
| Safety control quantity index | 0.2831 | 0.7169 | 0.13 |
| Investment in switchgear | 0.4115 | 0.5885 | 0.12 |
| Difficulty of operation control | 0.4862 | 0.5138 | 0.07 |
And 5: calculating comprehensive evaluation values before and after the ring is broken of the electromagnetic looped network:
calculating a comprehensive evaluation value g (x) by using an electromagnetic ring network comprehensive energy efficiency evaluation model, and assuming that a weight vector of an evaluation level is p ═ p (p)1，p2，p3，...，pl) (ii) a The weight vector of the evaluation index is O ═ q (q)s1，qs2，qs3，...，qsm) The calculation formula of the electromagnetic ring network comprehensive energy efficiency evaluation model is as follows:
wherein g represents the comprehensive evaluation value of the electromagnetic looped network, PsWeight q representing the s-th evaluation level obtained with reference to step 3sjWeight, x, representing the jth evaluation index included in the s-th evaluation hierarchy obtained in reference step 4sjThe value of the jth evaluation index included in the s-th hierarchy acquired in reference step 2 is shown.
Referring to tables 1 and 3 and fig. 1: q. q.s11＝q1；q22＝q2；q33＝q3；q44＝q4；q45＝q5；q56＝q6；q57＝q7；x11＝x1；x22＝x2；x33＝x3；x44＝x4；x45＝x5；x56＝x6；x57＝x7；
p1、p2、p3、p4、p5Respectively representing the weight of static stability safety, the weight of transient stability safety, the weight of thermal stability safety, the weight of safety and stability control and the weight of operation economy under the electromagnetic ring network landing non-ring-opening operation mode; q. q.s11、q22、q33、q44、q45、q56、q57Respectively representing the weight of a static stability margin index contained in static stability safety, the weight of a transient stability margin index contained in transient stability safety, the weight of a thermal stability margin index contained in thermal stability safety, the weight of a safety control quantity index contained in safety stability control, the weight of operation control difficulty contained in safety stability control, the weight of switchgear investment contained in operation economy and the weight of a short-circuit current index contained in operation economy under the electromagnetic ring network landing non-looping operation mode; x is the number of11、x22、x33、x44、x45、x56、x57The method comprises the steps of respectively representing a static stability margin index value contained in static stability safety, a transient stability margin index value contained in transient stability safety, a thermal stability margin index value contained in thermal stability safety, a safety control quantity index value contained in safety stability control, an operation control difficulty value contained in safety stability control, a switch equipment investment value contained in operation economy and a short-circuit current index value contained in operation economy under the electromagnetic ring network landing non-looping operation mode.
According to the steps, the comprehensive evaluation value of the operation of the electromagnetic ring network without ring opening when falling to the ground is 0.42, namely the comprehensive evaluation value of the operation of the electromagnetic ring network with ring closing is 0.42.
Referring to the steps 2 to 4, acquiring a comprehensive evaluation value of 0.097 of the landing full-solution operation of the electromagnetic ring network, namely, the comprehensive evaluation value of 0.097 of the ring-solution operation of the electromagnetic ring network;
comparing the comprehensive evaluation values before and after the ring is separated from the electromagnetic ring network, the comprehensive evaluation value of the ring closing operation of the electromagnetic ring network is far larger than the comprehensive evaluation value of the full solution of the grounding of the electromagnetic ring network, so that the ring closing operation is suggested.
The electromagnetic ring network of the Shanxi delivery channel is subjected to simulation calculation, the integral sending capacity of the Shanxi delivery channel before and after ring release is basically not changed into 27000MW, but under the severe extra-high voltage fault after ring release, the Shanxi and extra-high voltage matched units need to be cut off more than 10000MW to keep the system safe and stable, the problems of system frequency instability and the like are easily caused, under the operation mode of ring closing, the severe extra-high voltage fault can keep the system stable without cutting off loads, and meanwhile, the short-circuit current of an overproof station can be effectively controlled by adopting the operation of an extra-high voltage main transformer denominator. The result shows that the Shanxi extra-high voltage sending-out channel is suitable for closed-loop operation and is consistent with the final decision result of the method; the method for evaluating the electromagnetic looped network open-close loop through the quantitative analysis is simple and has high evaluation result accuracy.
The embodiment of the invention also provides an evaluation system for the electromagnetic ring network loop-opening and closing, which can be used for executing the method, wherein the system comprises the following components:
constructing a module: an evaluation system for evaluating an electromagnetic looped network open-close loop mode is built, wherein the evaluation system comprises l evaluation levels, and the l evaluation levels comprise m evaluation indexes;
a first calculation module: the method is used for calculating the values of evaluation indexes before and after the ring is broken of the electromagnetic ring network;
a first obtaining module: the method is used for obtaining the weight of each evaluation level before and after the ring is broken down of the electromagnetic ring network according to the analytic hierarchy process and the value of each evaluation index;
a second calculation module: the method is used for calculating the weight of each evaluation index before and after the ring is broken by the electromagnetic ring network by using an entropy weight method according to the value of each evaluation index;
a third calculation module: the method is used for calculating the comprehensive evaluation values before and after the electromagnetic ring network is looped off according to the values of the evaluation indexes before and after the electromagnetic ring network is looped off, the weights of the evaluation levels before and after the electromagnetic ring network is looped off and the weights of the evaluation indexes before and after the electromagnetic ring network is looped off, and judging the operation scheme of the electromagnetic ring network looped off.
A judging module: the comprehensive evaluation value before and after the ring is disassembled of the electromagnetic ring network is compared, and if the comprehensive evaluation value before the ring is disassembled of the electromagnetic ring network is larger than the comprehensive evaluation value after the ring is disassembled, the operation mode that the electromagnetic ring network is not disassembled is selected; otherwise, selecting the operation mode of ring opening of the electromagnetic ring network.
The embodiment of the invention also provides an evaluation system of the electromagnetic ring network loop-opening and closing loop, which can also be used for executing the method and comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the aforementioned method.
The invention provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the aforementioned method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
According to the evaluation method, system and storage medium for the electromagnetic ring network open/close loop, a complete evaluation system for evaluating the electromagnetic ring network open/close loop is established, a hierarchical analysis method is used for obtaining the weight of each evaluation level in the evaluation levels, the weight of each evaluation index contained in each evaluation level is obtained through an entropy weight method, the comprehensive evaluation value before and after the electromagnetic ring network open/close loop is calculated through an electromagnetic ring network comprehensive energy efficiency evaluation model, and the method for evaluating the electromagnetic ring network combined loop is obtained by comparing the comprehensive evaluation values before and after the electromagnetic ring network open/close loop; the invention provides a method for evaluating the electromagnetic looped network open-close loop through quantitative analysis, which has important significance for evaluating the electromagnetic looped network open-close loop and can be expanded and applied to the research of the common electromagnetic looped network open-close loop to a certain extent.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (12)
1. The evaluation method for the electromagnetic looped network open and close loop is characterized by comprising the following steps:
an evaluation system for evaluating the operation mode of the electromagnetic looped network open-close loop is constructed, wherein the evaluation system comprises l evaluation levels, and the l evaluation levels comprise m evaluation indexes;
calculating values of evaluation indexes before and after the ring is broken of the electromagnetic ring network;
obtaining the weight of each evaluation level before and after the ring is broken of the electromagnetic looped network according to the analytic hierarchy process and the value of each evaluation index;
according to the value of each evaluation index, calculating the weight of each evaluation index before and after the electromagnetic looped network is broken by using an entropy weight method;
and calculating comprehensive evaluation values before and after the ring is broken of the electromagnetic ring network according to the values of the evaluation indexes before and after the ring is broken of the electromagnetic ring network, the weights of the evaluation levels before and after the ring is broken of the electromagnetic ring network and the weights of the evaluation indexes before and after the ring is broken of the electromagnetic ring network, and judging the operation scheme of the ring is broken and closed of the electromagnetic ring network.
2. The method for evaluating an open loop and close loop of an electromagnetic ring network according to claim 1, wherein the method for judging the operating scheme of the open loop and close loop of the electromagnetic ring network comprises the following steps:
comparing the comprehensive evaluation values before and after the ring is separated from the electromagnetic ring network, and selecting an operation mode that the electromagnetic ring network is not separated if the comprehensive evaluation value before the ring is separated from the electromagnetic ring network is larger than the comprehensive evaluation value after the ring is separated; otherwise, selecting the operation mode of ring opening of the electromagnetic ring network.
3. The method for evaluating an electromagnetic looped network link tripping device as recited in claim 1, wherein said evaluation index comprises: static stability margin index, transient stability margin index, thermal stability margin index, safety control quantity index, operation control difficulty index, switch equipment investment index and short-circuit current index.
4. The method for evaluating an electromagnetic ring network decoupling ring according to claim 1, wherein the evaluation levels include static stability safety, transient stability safety, thermal stability safety, safety and stability control, and operation economy.
5. The evaluation method of an electromagnetic looped network link, as recited in claim 3,
the calculation formula of the static stability margin index is as follows:
wherein, KpsRepresenting the static stability margin after an N-1 accident; pzRepresenting the normal mode of transporting the tidal current; pjsRepresenting the post-accident static stability limit;
the transient stability margin index is calculated according to the following formula:
wherein, KmRepresents a transient stability margin indicator, PjmRepresenting the transient stability limit of the outgoing section;
the calculation formula of the thermal stability margin index is as follows:
wherein, KpnRepresents the thermal stability margin; pjnThe thermal stability limit of the high-voltage grade line after the N-1 accident is represented;
the calculation formula of the safety control quantity index mu is as follows:
wherein, Δ pzRepresenting the final safety control machine cutting amount;
the operation control difficulty index sigma is as follows:
the calculation formula of the switchgear investment index W is as follows:
W＝∑wk(Ikmax/Ik)2M
wherein, wkA weight factor representing the bus k; i iskRepresenting three-phase short-circuit current of a bus k; i iskmaxRepresents the maximum breaking current of the switchgear, M being a positive real number, usually taken as 1;
the short-circuit current index is calculated by the following formula:
wherein, KIDenotes the short-circuit current index, kIhShowing the short-circuit current margin of the h-th station on both sides of the power transmission section, ImaxhRepresents the h-th station short-circuit current interruption capacity, IshThe short-circuit current of the h-th station is shown, and n is the number of lines of the station.
6. The method for evaluating an open loop of an electromagnetic ring network as claimed in claim 1, wherein the calculation formula for obtaining the weight of each evaluation level is:
wherein, wsThe weight representing the s-th evaluation level,
wherein,score representing the s-th level, asyAnd a judgment value representing the s-th rating level with respect to the y-th rating level obtained from the analytic hierarchy process and the values of the evaluation indexes.
7. The method for evaluating an open loop of an electromagnetic ring network as claimed in claim 1, wherein the weight of each evaluation index is calculated as follows:
wherein q isjThe weight of the jth evaluation index; gjIndicates the value of the jth evaluation index.
8. The method for evaluating an open loop and close loop of an electromagnetic ring network as claimed in claim 1, wherein the calculation formula for calculating the comprehensive evaluation value before and after the open loop of the electromagnetic ring network is:
wherein g represents the comprehensive evaluation value of the electromagnetic looped network, PsWeight representing the s-th evaluation level, qsjWeight, x, representing the jth evaluation index contained in the s-th evaluation hierarchysjAnd a value indicating the j-th evaluation index included in the s-th evaluation hierarchy.
9. An evaluation system for an electromagnetic looped network open/close loop, the system comprising:
constructing a module: an evaluation system for evaluating the operation mode of the electromagnetic looped network open-close loop is constructed, wherein the evaluation system comprises l evaluation levels, and the l evaluation levels comprise m evaluation indexes;
a first calculation module: the method is used for calculating the values of evaluation indexes before and after the ring is broken of the electromagnetic ring network;
a first obtaining module: the method is used for obtaining the weight of each evaluation level before and after the ring is broken down of the electromagnetic ring network according to the analytic hierarchy process and the value of each evaluation index;
a second calculation module: the method is used for calculating the weight of each evaluation index before and after the ring is broken by the electromagnetic ring network by using an entropy weight method according to the value of each evaluation index;
a third calculation module: the method is used for calculating the comprehensive evaluation values before and after the electromagnetic ring network is looped off according to the values of the evaluation indexes before and after the electromagnetic ring network is looped off, the weights of the evaluation levels before and after the electromagnetic ring network is looped off and the weights of the evaluation indexes before and after the electromagnetic ring network is looped off, and judging the operation scheme of the electromagnetic ring network looped off.
10. The system for evaluating an electromagnetic looped network link, as recited in claim 9, further comprising:
a judging module: the comprehensive evaluation value before and after the ring is disassembled of the electromagnetic ring network is compared, and if the comprehensive evaluation value before the ring is disassembled of the electromagnetic ring network is larger than the comprehensive evaluation value after the ring is disassembled, the operation mode that the electromagnetic ring network is not disassembled is selected; otherwise, selecting the operation mode of ring opening of the electromagnetic ring network.
11. The evaluation system for the electromagnetic looped network loop opening and closing is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 7.
12. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910388143.7A CN110197322A (en) | 2019-05-10 | 2019-05-10 | A kind of evaluation method, system and the storage medium of the cyclization of electromagnetic looped network solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910388143.7A CN110197322A (en) | 2019-05-10 | 2019-05-10 | A kind of evaluation method, system and the storage medium of the cyclization of electromagnetic looped network solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110197322A true CN110197322A (en) | 2019-09-03 |
Family
ID=67752523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910388143.7A Pending CN110197322A (en) | 2019-05-10 | 2019-05-10 | A kind of evaluation method, system and the storage medium of the cyclization of electromagnetic looped network solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110197322A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404163A (en) * | 2020-05-11 | 2020-07-10 | 国网湖南省电力有限公司 | Electromagnetic looped network open-loop method |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105512783A (en) * | 2014-10-16 | 2016-04-20 | 东北电力大学 | Comprehensive evaluation method used for loop-opening scheme of electromagnetic looped network |
| CN106777597A (en) * | 2016-12-01 | 2017-05-31 | 国家电网公司 | A kind of channel-style electromagnetic looped network unlinks criterion method |
-
2019
- 2019-05-10 CN CN201910388143.7A patent/CN110197322A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105512783A (en) * | 2014-10-16 | 2016-04-20 | 东北电力大学 | Comprehensive evaluation method used for loop-opening scheme of electromagnetic looped network |
| CN106777597A (en) * | 2016-12-01 | 2017-05-31 | 国家电网公司 | A kind of channel-style electromagnetic looped network unlinks criterion method |
Non-Patent Citations (1)
| Title |
|---|
| 蔡万通等: "《基于惩罚性变权最优综合评价模型的电磁环网解合环方案分析》", 《电网技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404163A (en) * | 2020-05-11 | 2020-07-10 | 国网湖南省电力有限公司 | Electromagnetic looped network open-loop method |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Esmaeilian et al. | Prevention of power grid blackouts using intentional islanding scheme | |
| CN105281344B (en) | A kind of intelligent distribution network self-healing recovery optimization method considering power quality and uncertainty constraint | |
| CN104578416B (en) | Energy storage monitoring system | |
| CN104158178B (en) | Power partition recovery and global optimization method based on the intelligent power distribution net of reliability | |
| CN110929212B (en) | Online calculation method for searching weak thermal stability section of large power grid and formulating quota | |
| CN110197322A (en) | A kind of evaluation method, system and the storage medium of the cyclization of electromagnetic looped network solution | |
| CN110488199A (en) | A kind of high capacity cell energy-accumulating power station battery system alarm response method | |
| CN103870695A (en) | Judgment method for voltage level of high power accessing power grid | |
| CN105956783A (en) | Power transmission line risk assessment method | |
| CN111275312A (en) | Method and system for comprehensively evaluating and sequencing severity of multiple faults of power grid | |
| CN105160148B (en) | A kind of alternating current-direct current power network cascading failure critical circuits discrimination method | |
| CN104242299A (en) | Power grid partitioning method considering circuit electrical betweenness | |
| CN110020784B (en) | Method for evaluating loop opening and closing of sending-end electromagnetic looped network based on game theory | |
| CN111092430B (en) | Emergency resource optimal configuration method suitable for power system recovery | |
| CN111404163A (en) | Electromagnetic looped network open-loop method | |
| CN110649626A (en) | Receiving-end power grid layered optimization load shedding method and system | |
| CN108539740A (en) | A kind of power grid accident anticipation simulation system and its method | |
| CN108808661A (en) | Consider the multiple failure static security analysis method of scissors crossing and passway for transmitting electricity | |
| CN112448478B (en) | Transformer load control method | |
| Mao et al. | Rapid recovery control method based on improved VDCOLs for hybrid multi-infeed DC transmission system after AC failure | |
| CN112290547B (en) | Power transmission network line power flow out-of-limit solving method and equipment based on network reconstruction | |
| CN105449646B (en) | A kind of power distribution network electromagnetic looped network Impedance method | |
| Kudiyarasan et al. | Modern analysis of power flow and network stability of transmission lines for nuclear power dispatch | |
| CN107492885A (en) | A kind of method of basic power network framework under determination extreme condition | |
| Chen et al. | Research on Evaluation Method of Open-loop Scheme of Electromagnetic Loop Network Based on Comprehensive Weight |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190903 |