CN108666986B - A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph - Google Patents
A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph Download PDFInfo
- Publication number
- CN108666986B CN108666986B CN201810379394.4A CN201810379394A CN108666986B CN 108666986 B CN108666986 B CN 108666986B CN 201810379394 A CN201810379394 A CN 201810379394A CN 108666986 B CN108666986 B CN 108666986B
- Authority
- CN
- China
- Prior art keywords
- branch
- alternating
- node
- connected subgraph
- current field
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The high voltage direct current that the invention discloses a kind of based on connected graph exchanges field device connected trouble method of discrimination, including constructing complete alternating-current field connected graph, the alternating-current field connected subgraph for correcting initial time T, the alternating-current field connected subgraph for correcting following instant, judge that fault condition and taking controls safeguard measure.Method of the invention judges the equipment connected trouble of 3/2nds wiring alternating-current fields with connected graph algorithm; simultaneously alternating current filter splitting bus operation troubles, last route/last circuit breaker trip failure can efficiently, accurately differentiate from failure principle; to take corresponding control safeguard measure in time; it avoids direct current system primary equipment from further being damaged, ensures grid equipment safety.
Description
Technical field
The present invention relates to electric power system control operations and protection technique field, more particularly to more high-voltage dc transmission electric units
The method of discrimination of direct current system exchange field device connected trouble under the conditions of parallel running.
Background technique
In high voltage direct current transmission project, mainly passing through switchgear completes alternating current filter for the effect of converter station alternating-current field
And the electrical connection of the equipment such as reactive-load compensation equipment, converter power transformer, exchange feeder line, station local coordinate frame.Conventional converter valve is normal
A large amount of reactive power need to be consumed when unlock operation, while converter valve is the harmonic source of ac and dc systems, rectification or reversals
In can generate harmonic current, influence the normal operation of ac and dc systems electrical equipment.To make up the consumption of customary DC converter valve
Reactive power and filter out the change of current generation harmonic current, in alternating-current field access big group of alternating current filter, controlled by direct current station
Host controls the switching of filter group, to guarantee the stabilization of AC system power quality.The unlock operation of customary DC unit
Big group of the alternating current filter reliable electrical connection for needing in the process and exchanging feeder line, being put into the presence of group, and for flexible straight
Unit is flowed, unlocking need to only keep not needing connection alternating current filter with the connection for exchanging feeder line in operational process.
HVDC transmission system alternating-current field is generally 3/2nds wiring, and equipment connected trouble mainly includes exchange filter
Wave device splitting bus operation troubles, last breaker/last line tripping fault etc..Alternating current filter splitting bus operation troubles
The connected trouble for referring to alternating current filter Yu customary DC unit, when the non-Electromagnetic coupling of bus, in fact it could happen that the routine of operation
Direct current component is respectively coupled on different buses from alternating current filter, loses electrical connection between the two, if needing switching should at this time
Filter does not actually have any effect to control the idle of the customary DC unit, can raise or drag down instead the filtering
The alternating voltage of the connected bus of device has great risk to the safe operation of primary equipment and direct current system.Last breaker/last
Line tripping fault is routine/flexible direct current unit and the connected trouble that exchanges feeder line, direct current list after a certain circuit breaker trip
It is first with all feeder lines that exchange without electrical connection, then direct current component is likely to occur serious overvoltage, influences the safety of primary equipment
Operation.
With the development of high voltage dc transmission technology, occur in recent years the multiple direct current transportation units of same converter station (or
Valve group) parallel running new technology, the alternating-current field of the same converter station contains multiple customary DC units (or valve group), flexible
Direct current component and alternating current filter is organized greatly, the connection situation for exchanging field device becomes increasingly complex, and it is in parallel to be badly in need of research multiple-unit
The method of discrimination of field device connection dependent failure is exchanged under the complicated direct current system of operation.
Summary of the invention
In order to solve problems in the prior art, the present invention proposes that a kind of high voltage direct current exchange field device based on connected graph connects
Logical fault distinguishing method, to differentiate alternating current filter splitting bus operation troubles, last route/last circuit breaker trip failure etc.
It exchanges field device and is connected to dependent failure, to cut off fault element in time, accident range is avoided to expand.
To achieve the above object, technical scheme is as follows:
A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph, comprising the following steps:
1) complete alternating-current field connected graph G=(V, E) is constructed according to the topological structure of alternating-current field, wherein V={ v1,v2,
v3... be each electrical node of alternating-current field set, E={ e1,e2,e3... } and be each electric branch circuit of alternating-current field set；
2) initial time T is connected to alternating-current field according to the division state of each disconnecting switch of alternating-current field and grounding switch
Figure is modified, and forms the alternating-current field connected subgraph G of initial time TT=(VT,ET), it is assumed that it includes n node, m branch,
Then VT={ v1,v2,…,vn, ET={ e1,e2,…,em, for each branch eiIt is represented by the set of leg endpoint
3) after the alternating-current field connected subgraph building for completing initial time T, according to the displacement feelings of disconnecting switch and grounding switch
The alternating-current field connected subgraph of condition real-time update following instant, specifically: in coincidence and two being flanked in breaker two sides disconnecting switch
Ground disconnecting link closes the breaker of a certain branch in the case where quartile, then is equivalent to and increases a branch；Breaker two sides every
It leaves pass and when the breaker of a certain branch of tripping in the case where quartile, is equivalent to reduction one in coincidence and two sides grounding switch
Branch；
4) each connected subgraph of current alternating-current field is scanned, judge whether there is alternating current filter splitting bus operation,
Last breaker/last line tripping fault simultaneously takes corresponding control safeguard measure.
The invention has the advantages that
(1) differentiate suitable for the complicated direct current system exchange field device connected trouble of multiple-unit parallel running, to alternating-current field
Complexity it is insensitive.
(2) event can be run to alternating current filter splitting bus simultaneously from failure principle in the method for connected graph judgement
The failures such as barrier, last route/last circuit breaker trip efficiently, accurately differentiate, to take corresponding control to protect in time
Shield measure avoids direct current system primary equipment from further being damaged.
Detailed description of the invention
Fig. 1 is the schematic diagram of alternating-current field connected graph of the present invention；
Fig. 2 is the flow chart of method of discrimination of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Embodiment
As depicted in figs. 1 and 2, a kind of high voltage direct current based on connected graph exchanges field device connected trouble method of discrimination, packet
Include following steps:
1) complete alternating-current field connected graph G=(V, E) is constructed according to the topological structure of alternating-current field, wherein V={ v1,v2,
v3... be each electrical node of alternating-current field set, E={ e1,e2,e3... be each electric branch circuit of alternating-current field set, simplify
Model is as shown in Figure 1.Each electric branch circuit includes 1 breaker, 2 disconnecting switch and 2 grounding switchs, and if only if branch
Breaker and its two sides disconnecting switch coincidence, two sides grounding switch in the case where quartile the branch be effective branch.By
It is usually 3/2nds wiring in the alternating-current field of converter station, there are following characteristics for alternating-current field connected graph as shown in Figure 1:
A. it is in region ZuOr ZdAll branches be respectively provided with same node v1Or v2, which is the public affairs of each exchange string
Common bus, defined herein as core node, therefore region ZuOr ZdConnected subgraph where interior any branch necessarily includes node v1Or
v2；
B. node v1With v2Necessary and sufficient condition in same connected subgraph exchanges three branches in going here and there (such as at least one
E in Fig. 11、e2、e3) belong to same connected subgraph；
C. the connected subgraph that communicating site is possible to occur includes three classes: I class is that node set only includes node v1Or section
Point v2The connected subgraph of one of them；II class is that node set had both included node v1It again include node v2Connected subgraph, hand at this time
Flow field is Electromagnetic coupling state；Group III is that node set does not include node v1Or v2Connected subgraph, in the subgraph set only
One is in region ZmBranch.
2) for initial time T, according to the division state of each disconnecting switch of alternating-current field and grounding switch, rejecting has switched to examine
The branch that the branch or node and disconnecting switch or grounding switch for repairing state have disconnected, is modified alternating-current field connected graph,
Form the alternating-current field connected subgraph G of initial time TT=(VT,ET).Assuming that including n node, m branch, then V after rejectingT=
{v1,v2,…,vn, ET={ e1,e2,…,em, for each branch eiIt is represented by the set of leg endpointTool
Body modification method is as follows:
21) with core node v1With v2Initial connection subset is established respectivelyWith
Wherein node setSet of fingersIt is empty set；
22) electric branch circuit set E each to alternating-current fieldTIn branch carry out one by one ownership connected subgraph verification, for i-th
Branch
If two nodesWithIt is belonging respectively to connected subgraphWithIt then will be even
Logical subgraphIt is merged into connected subgraphThe node of two connected subgraphs merges, and branch is except conjunction
And it should also increase branch e outsidei, connected subgraphIt is set to empty set, at this timeFor II class connected subgraph, alternating-current field
For Electromagnetic coupling state；
If two nodesWithIt is not admitted to connected subgraphOrWith branch ei
Establish a new connected subgraphX is the number of the connected subgraph, wherein
If two nodesWithOnly one belongs to connected subgraphOrThen
It will not belong to the node and branch e of subgraphiIt is added in connected subgraph together；
23) it repeats step 22) and adds remaining branch, until ET={ e1,e2,…,emIn all equal merger of branch it is complete
At.
3) after the alternating-current field connected subgraph building for completing initial time T, according to the displacement feelings of disconnecting switch and grounding switch
The alternating-current field connected subgraph of condition real-time update following instant.Breaker two sides disconnecting switch is in coincidence and two sides grounding switch exists
The breaker of a certain branch is closed in the case where quartile, then be equivalent to increase a branch, the update method of connected subgraph with it is upper
One step 22) is identical.Breaker two sides disconnecting switch coincidence and tripping in the case where quartile of two sides grounding switch it is a certain
When the breaker of branch, connected subgraph set is corrected according to the following steps:
If 31) the non-Electromagnetic coupling state of alternating-current field at this time, and the branch is in region Zm, due to there are three types of connected subgraphs
Type, the branch can not can increase connected subgraph after disconnecting, therefore only need to be by the branch and lateral node from original son when correcting
It is rejected in figure；
If 32) the non-Electromagnetic coupling state of alternating-current field at this time, and the branch is in region ZuOr ZdIf in same exchange string
In region ZmBranch exist, then increase the branch as Group III connected subgraph, and by the branch and branch eiFrom atomic diagram
Middle rejecting, otherwise with previous step same treatment；
33) if alternating-current field is Electromagnetic coupling state at this time, and the branch is on cyclization string, then with step 31) and step
32) same way is handled；
34) if alternating-current field is by uniquely going here and there Electromagnetic coupling at this time, and the branch is on unique cyclization string, then is connected II class
Logical subgraphAccording to node v1Or v2Connection be split as connected subgraphWith
35) if alternating-current field passes through multiple string Electromagnetic couplings at this time, and the branch is on a certain cyclization string, only need to be from connection
The branch is rejected in subgraph, node is not rejected.
4) each connected subgraph of current alternating-current field is scanned, judge whether there is alternating current filter splitting bus operation,
Last breaker/last line tripping fault simultaneously takes corresponding control safeguard measure:
If node/the connected subgraph A. rejecting the connected subgraph after branch or rejecting from former connected subgraph has in unlock
The routine of state/flexible direct current cell node but no feed connection node then meet last breaker/last route protection movement item
Part is answered tripping without all customary DC unit incoming breakers in the connected subgraph of feed connection node at this time and is latched, and stops defeated
Send dc power；
If B. containing customary DC cell node and feed connection node in the unlocked state in a certain connected subgraph, but do not have
There are group's filter investment or available filter node, then alternating-current field meets splitting bus protection act condition, should jump at this time
It opens all customary DC unit incoming breakers in the connected subgraph and is latched；
If C. containing the filter node of group's filter investment in a certain connected subgraph, but it is not on unlock shape
The customary DC cell node of state, since alternating current filter will greatly drive up the voltage level of feed connection node or ac bus, this
When answer group's filter switch in the tripping connected subgraph；
D. after unlocking routine/flexible direct current unit, if without feed connection node, alternating-current field in connected subgraph where the unit
Meet last breaker/last route protection operation condition, answer the tripping routine/flexible direct current unit incoming breaker and closes
It locks, all group's filter switches in the tripping subgraph.
High voltage direct current based on connected graph of the invention exchanges field device connected trouble method of discrimination, is suitable for multiple-unit simultaneously
The complicated direct current system of through transport row judges the equipment connected trouble of 3/2nds wiring alternating-current fields, Neng Goucong with connected graph algorithm
The failures such as alternating current filter splitting bus operation troubles, last route/last circuit breaker trip are carried out simultaneously in failure principle
Efficiently, accurately differentiate, to take corresponding control safeguard measure in time, avoid direct current system primary equipment by further
Damage ensures grid equipment safety.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair
Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.
Claims (3)
1. a kind of high voltage direct current based on connected graph exchanges field device connected trouble method of discrimination, which is characterized in that including following
Step:
1) complete alternating-current field connected graph G=(V, E) is constructed according to the topological structure of alternating-current field, wherein V={ v1,v2,v3,…}
For the set of each electrical node of alternating-current field, E={ e1,e2,e3... } and be each electric branch circuit of alternating-current field set；Each branch includes
1 breaker, 2 disconnecting switch and 2 grounding switchs, breaker and its two sides disconnecting switch and if only if branch are closing
Position, two sides grounding switch branch in the case where quartile are effective branch；Alternating-current field connected graph G=(V, E) has following spy
Sign:
A. it is in region ZuOr ZdAll branches be respectively provided with same node v1Or v2, which is the public mother of each exchange string
Line is defined as core node, region ZuOr ZdConnected subgraph where interior any branch necessarily includes node v1Or v2；
B. node v1With v2Necessary and sufficient condition in same connected subgraph belongs to same for three branches at least one exchange string
Connected subgraph；
C. the connected subgraph of alternating-current field includes three classes:
I class is that node set only includes node v1Or node v2The connected subgraph of one of them；
II class is that node set had both included node v1It again include node v2Connected subgraph, at this time alternating-current field be Electromagnetic coupling state；
Group III is that node set does not include node v1Or v2Connected subgraph, only one is in region Z in the subgraph setm's
Branch；
2) for initial time T, according to the division state of each disconnecting switch of alternating-current field and grounding switch, to alternating-current field connected graph into
Row amendment, forms the alternating-current field connected subgraph G of initial time TT=(VT,ET), it is assumed that it includes n node, m branch, then VT
={ v1,v2,…,vn, ET={ e1,e2,…,em, for each branch eiIt is expressed as the set of leg endpoint
3) after the alternating-current field connected subgraph building for completing initial time T, the displacement situation according to disconnecting switch and grounding switch is real
The alternating-current field connected subgraph of Shi Gengxin following instant, specifically: in breaker two sides disconnecting switch in coincidence and two sides earthing
Lock closes the breaker of a certain branch in the case where quartile, then is equivalent to and increases a branch；Keep apart in breaker two sides
It closes in coincidence and two sides grounding switch when the breaker of a certain branch of tripping in the case where quartile, is equivalent to and reduces by a branch
Road；
4) each connected subgraph of current alternating-current field is scanned, judges whether there is alternating current filter splitting bus and runs, is last
Breaker/last line tripping fault simultaneously takes corresponding control safeguard measure:
If A. the connected subgraph after rejecting branch or the node/connected subgraph rejected from former connected subgraph have in the unlocked state
Routine/flexible direct current cell node but no feed connection node, then meet last breaker/last route protection operation condition,
Tripping is answered at this time without all customary DC unit incoming breakers in the connected subgraph of feed connection node and is latched, and it is straight to stop conveying
Flow power；
If B. containing customary DC cell node and feed connection node in the unlocked state in a certain connected subgraph, but not small
Group filter investment or available filter node, then alternating-current field meets splitting bus protection act condition, answers tripping should at this time
All customary DC unit incoming breakers in connected subgraph are simultaneously latched；
If C. containing the filter node of group's filter investment in a certain connected subgraph, but it is not on unlocked state
Customary DC cell node is answered at this time since alternating current filter will greatly drive up the voltage level of feed connection node or ac bus
Group's filter switch in the tripping connected subgraph；
D. after unlocking routine/flexible direct current unit, if without feed connection node, alternating-current field satisfaction in connected subgraph where the unit
Last breaker/last route protection operation condition is answered tripping routine/flexible direct current unit incoming breaker and is latched, jump
Open all group's filter switches in the connected subgraph.
2. the high voltage direct current according to claim 1 based on connected graph exchanges field device connected trouble method of discrimination, special
Sign is, the modification method of the alternating-current field connected subgraph of the initial time T the following steps are included:
21) with core node v1With v2Initial connection subset is established respectivelyWithWherein save
Point setSet of fingersIt is empty set；
22) electric branch circuit set E each to alternating-current fieldTIn branch carry out one by one ownership connected subgraph verification, for i-th branch
Road
If two nodesWithIt is belonging respectively to connected subgraphWithThen by connected subgraphIt is merged into connected subgraphThe node of two connected subgraphs merges, and branch is gone back in addition to merging
Branch e should be increasedi, connected subgraphIt is set to empty set, at this timeFor II class connected subgraph, alternating-current field is cyclization
Operating status；
If two nodesWithIt is not admitted to connected subgraphOrWith branch eiIt establishes
One new connected subgraphX is the number of the connected subgraph, wherein
If two nodesWithOnly one belongs to connected subgraphOrThen will not
Belong to the node and branch e of subgraphiIt is added in connected subgraph together；
23) it repeats step 22) and adds remaining branch, until ET={ e1,e2,…,emIn the equal merger of all branches complete.
3. the high voltage direct current according to claim 2 based on connected graph exchanges field device connected trouble method of discrimination, special
Sign is, in step 3, breaker two sides disconnecting switch in coincidence and two sides grounding switch closed in the case where quartile it is a certain
When the breaker of branch, the update method of connected subgraph is identical as step 22)；In breaker two sides disconnecting switch in coincidence and two
Side grounding switch when the breaker of a certain branch of tripping, then corrects connected subgraph in the case where quartile according to the following steps:
If 31) the non-Electromagnetic coupling state of alternating-current field at this time, and the branch is in region Zm, since connected subgraph only has three types,
The branch can not can increase connected subgraph after disconnecting, therefore only need to pick the branch and lateral node from original subgraph when amendment
It removes；
If 32) the non-Electromagnetic coupling state of alternating-current field at this time, and the branch is in region ZuOr ZdIf be in same exchange string
Region ZmBranch exist, then increase the branch as Group III connected subgraph, and by the branch and branch eiIt is picked from atomic diagram
It removes, otherwise with previous step same treatment；
33) if alternating-current field is Electromagnetic coupling state at this time, and the branch is on cyclization string, then with step 31) and step 32) phase
It is handled with mode；
34) if alternating-current field is by uniquely going here and there Electromagnetic coupling at this time, and the branch be on unique cyclization string, then the connection of II class is sub
FigureAccording to node v1Or v2Connection be split as connected subgraphWith
35) if alternating-current field passes through multiple string Electromagnetic couplings at this time, and the branch is on a certain cyclization string, only need to be from connected subgraph
Middle rejecting branch, node are not rejected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810379394.4A CN108666986B (en) | 2018-04-25 | 2018-04-25 | A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810379394.4A CN108666986B (en) | 2018-04-25 | 2018-04-25 | A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108666986A CN108666986A (en) | 2018-10-16 |
| CN108666986B true CN108666986B (en) | 2019-08-30 |
Family
ID=63780875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810379394.4A Active CN108666986B (en) | 2018-04-25 | 2018-04-25 | A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108666986B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110135109B (en) * | 2019-06-03 | 2022-07-01 | 西南交通大学 | Direct-current system multi-valve-group last circuit breaker identification method based on improved Tarjan algorithm |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300299B (en) * | 2016-09-23 | 2018-11-06 | 许继电气股份有限公司 | A kind of last breaker judgment method of the alternating-current field being related to bus connection switch and device |
-
2018
- 2018-04-25 CN CN201810379394.4A patent/CN108666986B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108666986A (en) | 2018-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108923415B (en) | Information physical cooperative attack analysis method in intelligent power grid line protection | |
| CN102508059B (en) | Topology error-preventing checking method based on intelligent identification of state of equipment | |
| WO2014201989A1 (en) | Distributed intelligence feeder line automated control method | |
| CN101917064B (en) | Back-up protection processing method of digital substation transformer based on GOOSE mode | |
| CN106067658B (en) | Parameterize Separation control equipment and/or the method and apparatus for protecting equipment | |
| CN110024245A (en) | Allow to transmit direct current in a network and protect the network from the method for the facility of the influence of short trouble simultaneously for controlling | |
| CN105379135B (en) | The system and method diagnosed automatically in real time in power network | |
| CN104821582B (en) | Turned for optimization method and its system based on the distribution network load of nonlinear integer programming | |
| CN106684810A (en) | Closed control method for judging DC circuit breaker fault capable of cascading and device thereof | |
| CN109787224A (en) | Method for generating regional power grid load transfer strategy for preventing cascading overload | |
| CN108963990A (en) | Route small current grounding fault processing method hand in hand based on transient power direction | |
| CN105896490A (en) | Fault processing method and device of power distribution network | |
| CN109950882A (en) | A kind of small power incorporating into power network guard method | |
| CN105226642A (en) | Power distribution network service restoration method under a kind of transformer station shut down accident | |
| CN108666986B (en) | A kind of high voltage direct current exchange field device connected trouble method of discrimination based on connected graph | |
| CN105391030B (en) | The plan isolated island division methods of polymerization are gradually loaded based on network topology structure load | |
| CN109921516A (en) | A kind of topology based on electrical principle and prevent maloperation method | |
| CN109361197A (en) | A kind of overcurrent protective device and method | |
| CN105762845B (en) | Method for determining mode of +/-10 kV flexible direct-current power distribution network connected to alternating-current power grid | |
| CN103872688A (en) | Automatic protecting method for double-annular-ring four-power-supply structure feeder | |
| CN103258668A (en) | Novel bus earthing knife-switch control method and system | |
| CN112234610B (en) | Reliability analysis method for feeder automation system controlled by centralized FTU | |
| CN104283217B (en) | Method for judging operation interval of power distribution network comprising distributed power supply and microgrid | |
| CN108736480A (en) | A kind of multichannel AC looped network type energy router | |
| CN112967904A (en) | Wiring structure of gas relay for converter transformer and signal output method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |