CN107977902A - A kind of power distribution station voltage measuring method based on a small number of evidences - Google Patents
A kind of power distribution station voltage measuring method based on a small number of evidences Download PDFInfo
- Publication number
- CN107977902A CN107977902A CN201610957016.0A CN201610957016A CN107977902A CN 107977902 A CN107977902 A CN 107977902A CN 201610957016 A CN201610957016 A CN 201610957016A CN 107977902 A CN107977902 A CN 107977902A
- Authority
- CN
- China
- Prior art keywords
- power
- voltage
- node
- line
- power distribution
- 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
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000009467 reduction Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012795 verification Methods 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
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Landscapes
- Business, Economics & Management (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Economics (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- General Health & Medical Sciences (AREA)
- Human Resources & Organizations (AREA)
- Marketing (AREA)
- Primary Health Care (AREA)
- Strategic Management (AREA)
- Tourism & Hospitality (AREA)
- Physics & Mathematics (AREA)
- General Business, Economics & Management (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a kind of power distribution station voltage measuring method based on a small number of evidences, belong to power distribution network management of power supply and power utilization field.Algorithm provided by the invention is suitable for tree topology, based on the data such as power distribution station head end voltage, head end active power, head end power factor, line length and parameter, each user node history power consumption, main line and branch line terminal voltage, in the case of can not know for sure each node active power and power factor, node voltage distribution to taiwan area is estimated, so as to relatively accurately grasp the low-voltage distribution situation of power distribution station, to take corresponding control measures to provide foundation.Algorithm provided by the invention solves the problem that Utilities Electric Co. cannot carry out a large number of users voltage of power distribution station all standing monitoring, contributes to Utilities Electric Co. preferably to lift power supply quality and service level.Since taiwan area voltage deviation can produce additional power losses on power distribution network transformer, circuit, extension wire loss is quantitatively calculated using this algorithm, and compare its shared proportion in line loss, foundation is provided to administer voltage deviation excessive problem from now on, foundation is provided for power distribution network saving energy and decreasing loss.
Description
Technical field
The present invention relates to a kind of power distribution station low-voltage assessment algorithm, belongs to power distribution network management of power supply and power utilization region.
Background technology
With the development of power industry, people increasingly pay attention to power quality problem.Power distribution network is used as and region be directly facing use
The electric system terminal at family, the management to power quality, especially quality of voltage are also stringent all the more.For power distribution station, its
Head end is connected to higher level's electric power system, and quality of voltage is usually qualified.However, the planning of some power distribution stations is unreasonable, power supply half
Footpath is excessive, and terminal voltage falls seriously.In addition, some supply line's line footpath selections are less than normal, with the increase of power load, circuit
Section cannot meet the requirement of current-carrying capacity, cause actual user's low voltage.It is normal that low-voltage seriously affects electrical equipment
Work, triggers customer complaint.
In order to propose targetedly control measures to power distribution station low voltage conditions, it is necessary to grasp user's low pressure point first
Cloth situation.The best method for grasping user's low voltage conditions is direct collection user's terminal voltage.Existing intelligent electric meter is except daily
Outside meter-reading function, the function of remote measurement user's voltage has been had been provided with.However, being limited by acquisition system performance, can adopt daily
The number of users of collection is limited, far can not realize all standing of user terminal voltage monitoring.
The present invention provides a kind of power distribution station voltage measuring method based on a small number of evidences.Based on the algorithm, only need to
The terminal voltage of all electricity consumption branches in radio area carries out calling survey together, in conjunction with head end electrical quantity, line parameter circuit value, user's history power consumption
Etc. information, it is possible to carry out accurate measuring and calculating to all user node voltages, realize all standing of power distribution station voltage monitoring.
Algorithm provided by the invention contributes to Utilities Electric Co. to grasp power distribution station low-voltage distribution situation in time, to formulate corresponding administer
Measure provides foundation.Quantify the added losses of voltage deviation problem on the line using this algorithm at the same time, and it is online to compare its
Shared proportion in path loss consumption, foundation is provided for circuit saving energy and decreasing loss.
The content of the invention
It is an object of the present invention to provide a kind of power distribution station low-voltage assessment algorithm based on a small number of evidences.Using the algorithm,
Only the terminal voltage of all electricity consumption branches in power distribution station need to be carried out calling survey together, in conjunction with head end electrical quantity, line parameter circuit value, Yong Huli
The information such as history power consumption, so that it may accurate measuring and calculating is carried out to all node voltages in power distribution station, helps Regulation people
Member grasps power distribution station low-voltage distributed intelligence in time, and foundation is provided to formulate low-voltage control measures.Carry out amount using this algorithm
Change the extension wire brought by voltage deviation problem to be lost, and compare its shared proportion in line loss, be circuit section
Damage can drop to provide foundation.
To reach this purpose, the present invention adopts the following technical scheme that.
A kind of power distribution station low-voltage assessment algorithm based on a small number of evidences, including following main contents：
(1) for a certain tree-shaped power distribution station topology, each bar branch that basic routing line extends is equivalent to concentrated load, structure
Into the simple circuit of single supply power supply.Known quantity for head end voltage, head end active power, head end power factor, line length with
Parameter, each node history power consumption, the terminal voltage of main line and each branch.
(2) according to typical Line Loss of Distribution Network System rate, total load active power is estimated by beginning active power.
(3) using each node history power consumption as weights, each node active power distribution is estimated.
(4) initial estimate using beginning power factor as each node power factor, calculates each node reactive power distribution
Initial estimate.
(5) according to line length, parameter and the node power of estimation, the trend distribution for obtaining circuit (ignores line impedance
The power attenuation of generation).From beginning, each node voltage numerical value is calculated backward successively, until terminal voltage.During reckoning
Ignore the horizontal component of voltage.
(6) if calculating, obtained terminal voltage is higher than measured value, each node power factor estimate before appropriate reduction,
On the contrary then each node power factor estimate before properly increasing, calculate again each node reactive power distribution (to beginning without
Work(power is also with the calculated value replacement under new power factor), each node voltage is calculated again.Iterate calculating, until calculating
Error between obtained terminal voltage and measured value meets that, to provisioning request, power factor converges on a final value, takes at this time each
Node voltage is final estimation result.
(7) for each bar branch, from corresponding node voltage, using main line power factor final value as each branch power
The initial estimate of factor, calculates the node voltage of each bar branch in the same way.
(8) to basic routing line, since end, circuit work(is calculated by line end power, voltage and line parameter circuit value
Rate is lost, and calculates power attenuation respectively by voltage estimate value and rated value, it is that voltage deviation problem is brought to draw power difference
Added losses.It is distributed according to Line Flow, calculates from back to front successively, calculate the power difference of every section of circuit, and compares
Proportion of the added losses in line loss.
Implement the embodiment of the present invention, have the advantages that：
Based on power distribution station head end voltage, head end active power, head end power factor, line length and parameter, each user
The information such as node history power consumption, each branch line terminal voltage, in each the user's active power and power factor of can not knowing for sure
In the case of, it is possible to accurate measuring and calculating is carried out to the whole network user node voltage, solving Utilities Electric Co. cannot be to power distribution station
A large number of users voltage carry out all standing monitoring problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology describe needed in attached drawing do and simply introduce.
Fig. 1 is low-voltage assessment algorithm flow chart in power distribution station provided by the invention；
Fig. 2 is the distribution network topology that embodiment 1 is studied；
Embodiment
To make the purpose of the present invention, technical solution clearer, the present invention will be described in further detail below.
A kind of method calculated based on minority according to power distribution station voltage provided by the invention, when it is implemented, including following
Step：
(1) for a certain tree-shaped power distribution station topology, each bar branch that basic routing line extends is equivalent to concentrated load, structure
Into the simple circuit of single supply power supply.
(2) according to typical Line Loss of Distribution Network System rate, total load active power is estimated by beginning active power.
(3) using each node history power consumption as weights, each node active power distribution is estimated.
(4) initial estimate using beginning power factor as each node power factor, calculates each node reactive power distribution
Initial estimate.
(5) according to line length, parameter and the node power of estimation, the trend distribution for obtaining circuit (ignores line impedance
The power attenuation of generation).From beginning, each node voltage numerical value is calculated backward successively, until terminal voltage.During reckoning
Ignore the horizontal component of voltage.
(6) if calculating, obtained terminal voltage is higher than measured value, each node power factor estimate before appropriate reduction,
On the contrary then each node power factor estimate before properly increasing, calculate again each node reactive power distribution (to beginning without
Work(power is also with the calculated value replacement under new power factor), each node voltage is calculated again.Iterate calculating, until calculating
Error between obtained terminal voltage and measured value meets that, to provisioning request, power factor converges on a final value, takes at this time each
Node voltage is final estimation result.
(7) for each bar branch, from corresponding node voltage, using main line power factor final value as each branch power
The initial estimate of factor, calculates the node voltage of each bar branch in the same way.
(8) to basic routing line, since end, circuit work(is calculated by line end power, voltage and line parameter circuit value
Rate is lost, and calculates power attenuation respectively by voltage estimate value and rated value, draws the i.e. voltage deviation problem of power difference in circuit
On added losses.It is distributed according to Line Flow, calculates from back to front successively, calculates the power difference of every section of circuit, and compare
Compared with added losses line loss proportion.
Embodiment 1：
In accordance with the above, for the distribution net topology shown in Fig. 2, carry out voltage using algorithm provided by the invention and estimate
Calculate, with the feasibility of the verification present invention.Obviously, embodiment herein is merely illustrative, rather than applies model to the present invention
The limitation enclosed.The scope of the present invention is defined by the appended.It will be apparent to those skilled in the art that do not making wound
The every other embodiment that the property made obtains on the premise of working, belongs to the scope of protection of the invention.
As shown in Fig. 2, the topology shares 9 nodes, supply voltage 380V, beginning active-power Ps=8502W, beginning
Power factorEach load bus information is as shown in table 1.Wherein, endpoint node voltage Uend=345.7V.
1 load bus information data of table
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| Active power (W) | 1279 | 1114 | 836.4 | 874.3 | 1217 | 1101 | 923.3 | 932.1 |
| Reactive power (Var) | 401.7 | 524.9 | 175.2 | 244.1 | 322 | 346 | 395.6 | 244 |
| Power factor | 0.95405 | 0.90461 | 0.97876 | 0.96317 | 0.96673 | 0.954 | 0.91918 | 0.9674 |
| Node voltage (V) | 374.8 | 368.9 | 361.9 | 356.7 | 351.8 | 347.8 | 346.7 | 345.7 |
Realization is programmed algorithm using MATLAB language.By beginning voltage, beginning power factor, load wattful power
The information input programs such as rate, terminal voltage.Operation program, can obtain the estimated value of each node voltage.By estimated value and reality
Value contrast, as shown in table 2.
Each node voltage estimated value of table 2 and deviation ratio
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| Estimated value (V) | 375.3 | 370.1 | 363.0 | 357.7 | 352.5 | 348.3 | 347.0 | 345.6 |
| Actual value (V) | 374.8 | 368.9 | 361.9 | 356.7 | 351.8 | 347.8 | 346.7 | 345.7 |
| Deviation ratio (deviation/actual value) | 0.13% | 0.33% | 0.3% | 0.28% | 0.2% | 0.14% | 0.09% | 0.03% |
As seen from Table 2, the deviation ratio of voltage estimate value and actual value is no more than 0.5%, and maximum deviation amount is 1.2V.
The simulation example demonstrates the feasibility of this algorithm.
To basic routing line, since end, line power damage is calculated by line end power, voltage and line parameter circuit value
Consumption, is calculated power attenuation by voltage estimate value and rated value, draws the added losses brought due to voltage deviation problem respectively.
It is distributed according to Line Flow, calculates from back to front successively, calculates the power difference of every section of circuit.
3 each sections of line power losses of table
As can be seen from Table 3, due to voltage deviation problem power added loss value, that is, line loss difference on the line not
Greatly, active loss accounting is the proportion that the additional active loss produced by voltage deviation accounts in circuit active loss, and account for
Proportion is larger, and end reaches 20.16%, the influence that distribution network electric energy is lost in voltage deviation by this example quantitative analysis,
Foundation is provided for its improvement.
Claims (3)
- A kind of 1. power distribution station voltage measuring method based on a small number of evidences, it is characterised in that：The algorithm is suitable for tree topology.
- 2. low-voltage assessment algorithm in power distribution station according to claim 1, it is characterised in that：The algorithm is with power distribution station Head end voltage, head end active power, head end power factor, line length and parameter, each user node history power consumption, main line and Based on the data such as branch line terminal voltage.
- 3. the power distribution station low-voltage assessment algorithm according to claim 1,2, it is characterised in that the algorithm includes as follows Step：(1) each bar branch that basic routing line extends is equivalent to concentrated load, forms the simple circuit of single supply power supply.(2) according to typical Line Loss of Distribution Network System rate, total load active power is estimated by beginning active power.(3) using each node history power consumption as weights, each node active power distribution is estimated.(4) initial estimate using beginning power factor as each node power factor, calculates the first of each node reactive power distribution Beginning estimate.(5) according to line length, parameter and the node power of estimation, the trend distribution for obtaining circuit (ignores line impedance generation Power attenuation).From beginning, each node voltage numerical value is calculated backward successively, until terminal voltage.Ignore during reckoning The horizontal component of voltage.(6) if calculating, obtained terminal voltage is higher than measured value, each node power factor estimate before appropriate reduction, on the contrary Each node power factor estimate before then properly increasing, the reactive power for calculating each node again are distributed (to the idle work(in beginning Rate is also with the calculated value replacement under new power factor), each node voltage is calculated again.Iterate calculating, is obtained until calculating Terminal voltage and measured value between error meet that, to provisioning request, power factor converges on a final value, take each node at this time Voltage is final estimation result.(7) for each bar branch, from corresponding node voltage, using main line power factor final value as each branch power factor Initial estimate, calculate the node voltage of each bar branch in the same way.(8) to basic routing line, since end, line power damage is calculated by line end power, voltage and line parameter circuit value Consumption, calculates power attenuation by voltage estimate value and rated value, draws the power attenuation difference due to voltage deviation problem respectively.Press It is distributed according to Line Flow, calculates from back to front successively, calculate the power difference of every section of circuit, and compare added losses at each section Proportion in line loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957016.0A CN107977902A (en) | 2016-10-25 | 2016-10-25 | A kind of power distribution station voltage measuring method based on a small number of evidences |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957016.0A CN107977902A (en) | 2016-10-25 | 2016-10-25 | A kind of power distribution station voltage measuring method based on a small number of evidences |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107977902A true CN107977902A (en) | 2018-05-01 |
Family
ID=62005189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610957016.0A Pending CN107977902A (en) | 2016-10-25 | 2016-10-25 | A kind of power distribution station voltage measuring method based on a small number of evidences |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107977902A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923540A (en) * | 2018-08-28 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | A kind of distribution feeder Load obtaining method and device measured based on segmentation |
| CN109857975A (en) * | 2018-12-29 | 2019-06-07 | 重庆邮电大学 | A kind of electric energy meter platform area and three-phase automatic identification method |
| CN111025081A (en) * | 2019-11-07 | 2020-04-17 | 广州南方电力集团科技发展有限公司 | Residential voltage monitoring method for power distribution area |
| CN111817283A (en) * | 2020-08-06 | 2020-10-23 | 江苏筑森建筑设计有限公司 | Method for calculating voltage loss of direct-current distribution line |
| CN113065731A (en) * | 2020-09-18 | 2021-07-02 | 国网浙江省电力有限公司金华供电公司 | Voltage quality problem cause analysis method and system based on ridge regression algorithm |
| CN113344435A (en) * | 2021-06-29 | 2021-09-03 | 南方电网数字电网研究院有限公司 | Platform power supply state evaluation device, electronic equipment and storage medium |
| CN115201742A (en) * | 2022-09-16 | 2022-10-18 | 北京志翔科技股份有限公司 | Method for determining error of metering point of low-voltage transformer area |
-
2016
- 2016-10-25 CN CN201610957016.0A patent/CN107977902A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923540A (en) * | 2018-08-28 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | A kind of distribution feeder Load obtaining method and device measured based on segmentation |
| CN108923540B (en) * | 2018-08-28 | 2022-11-25 | 云南电网有限责任公司电力科学研究院 | Power distribution network feeder load acquisition method and device based on segmented measurement |
| CN109857975A (en) * | 2018-12-29 | 2019-06-07 | 重庆邮电大学 | A kind of electric energy meter platform area and three-phase automatic identification method |
| CN111025081A (en) * | 2019-11-07 | 2020-04-17 | 广州南方电力集团科技发展有限公司 | Residential voltage monitoring method for power distribution area |
| CN111817283A (en) * | 2020-08-06 | 2020-10-23 | 江苏筑森建筑设计有限公司 | Method for calculating voltage loss of direct-current distribution line |
| CN111817283B (en) * | 2020-08-06 | 2024-03-29 | 江苏筑森建筑设计有限公司 | Calculation method for voltage loss of direct-current distribution line |
| CN113065731A (en) * | 2020-09-18 | 2021-07-02 | 国网浙江省电力有限公司金华供电公司 | Voltage quality problem cause analysis method and system based on ridge regression algorithm |
| CN113344435A (en) * | 2021-06-29 | 2021-09-03 | 南方电网数字电网研究院有限公司 | Platform power supply state evaluation device, electronic equipment and storage medium |
| CN113344435B (en) * | 2021-06-29 | 2023-02-24 | 南方电网数字电网研究院有限公司 | Platform power supply state evaluation device, electronic equipment and storage medium |
| CN115201742A (en) * | 2022-09-16 | 2022-10-18 | 北京志翔科技股份有限公司 | Method for determining error of metering point of low-voltage transformer area |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107977902A (en) | A kind of power distribution station voltage measuring method based on a small number of evidences | |
| CN105574238B (en) | A kind of section real power control analysis of strategies method for the assessment of online stability margin | |
| CN107666149B (en) | Medium-voltage distribution network line loss calculation method | |
| CN103746368B (en) | Method of optimizing static safe and stable operation limit of electric power system | |
| US20120022713A1 (en) | Power Flow Simulation System, Method and Device | |
| CN105356481B (en) | A kind of dynamic passive compensation reconnaissance method based on more feed-in short-circuit ratioes | |
| CN105826918A (en) | Method and system for calculating theoretical line loss of power grid | |
| CN103001219B (en) | A kind of more FACTS based on trend entropy optimize control method for coordinating | |
| CN112751326B (en) | Technical economy assessment method for medium-low voltage direct current power distribution and utilization system | |
| CN105427186A (en) | Power distribution network line loss calculation method based on improved equivalent electric resistance method | |
| CN104573853A (en) | Systematic solution for voltage quality evaluation and optimization of low-voltage transformer area distribution networks | |
| CN107069718A (en) | The low-voltage distribution network line loss calculation method influenceed based on three-phase imbalance on line loss | |
| CN107257130B (en) | Low-voltage distribution network loss calculation method based on regional measurement decoupling | |
| CN107748956A (en) | A kind of appraisal procedure of power distribution network typical wiring non-integer segmentation reliability | |
| CN106339830A (en) | Line loss factor control method based on power grid information data platform | |
| CN109802435A (en) | A kind of energy storage configuration place selection method of wind power integration system | |
| CN105186586B (en) | A kind of method for improving AC-DC hybrid power grid static electric voltage stability | |
| CN107104432B (en) | A kind of calculation method of distributed power access point voltage | |
| CN114362246B (en) | Power grid accessible distributed photovoltaic capacity measuring and calculating method | |
| CN104993481A (en) | Low-voltage transformer area six-element diagnosis and analysis method and system | |
| CN110867861B (en) | Method for accurately delimiting theoretical line loss of power distribution network | |
| CN107767060B (en) | Theoretical line loss calculation system and method for distribution network line | |
| CN110601176A (en) | Method and system for improving static stability limit of power grid tie line and early warning | |
| CN110096767A (en) | A kind of AC-DC hybrid power grid cascading failure emulation mode | |
| CN105184511A (en) | Power supply business expansion service system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180501 |
|
| WD01 | Invention patent application deemed withdrawn after publication |