CN105262067B - A kind of anti-isolated island protection system and method - Google Patents
A kind of anti-isolated island protection system and method Download PDFInfo
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- CN105262067B CN105262067B CN201510644820.9A CN201510644820A CN105262067B CN 105262067 B CN105262067 B CN 105262067B CN 201510644820 A CN201510644820 A CN 201510644820A CN 105262067 B CN105262067 B CN 105262067B
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Abstract
The invention discloses a kind of anti-isolated island protection system and method, system includes station domain isolated island detecting device, wireless communication system and anti-isolated island protection device；Stand domain isolated island detecting device, for gathering each circuit breaker position in transformer station, detect whether public electric wire net dead electricity and forms isolated island in real time, and pass through wireless communication system and send message to anti-isolated island protection device；The anti-isolated island protection device, the communication message of receiving station's domain isolated island detecting device transmission is transmitted by wireless communication system, voltage and frequency at the points of common connection of distributed power generation station are gathered, when meeting following either condition：1) receive and wirelessly connect jump message；2) radio communication is normal, meets low/overfrequency and low/non-sensitive section of criterion of overvoltage；3) radio communication is abnormal, meets low/overfrequency and low/over-pressed sensitive section of criterion, controls points of common connection circuit breaker trip.The present invention has the characteristics of economy for improving anti-isolated island protection system and sensitivity and reliability of the protection of anti-isolated island.
Description
Technical field
The present invention relates to a kind of anti-isolated island protection system and method, belong to distributed generation technology field.
Background technology
Island effect be distributed power generation it is grid-connected present in a major issue, so-called island effect refers to when electric power is public
Department is because of power supply trouble or has a power failure maintenance during escape, and the grid-connected system of each user terminal and the load of surrounding form an electricity
The self-energizing isolated island that power company can not control.This self-supporting island phenomenon can be to maintenance personal and electrical equipment even power network
Serious consequence is produced, therefore distributed generation system will can be timely detected the generation of island effect.In order to quick
Accurate to detect island effect, Utilities Electric Co. typically requires to install anti-isolated island protection device in distributed power source points of common connection,
When isolated island formation is detected, faster trip distributed power source.
The conventional principle of anti-isolated island protection mainly includes active, passive type and jumps mode based on communication link.Active original
Reason is generally required by applying disturbing signal to power network, is implemented more complicated and is influenceed the quality of power supply, therefore in relay protection
Rare use in device；The conventional principle of passive type was/low-voltage and mistake/low frequency detection method, major advantage be principle letter
List, it is easily achieved, but detection has certain blind area；It is grid-connected by detection switch position real-time judge that mode is jumped based on communication link
Whether system occurs isolated island, is that isolated island detects method the most direct, has the characteristics of high sensitivity, quick-action is good, but adopt
Needed to lay optical fiber with fiber optic communication, easily constrained by economy and construction inconvenience, many occasions implement comparison and are stranded
It is difficult.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the present invention to provide a kind of anti-isolated island protection system and method, use
Based on jump and low/overfrequency, the anti-isolated island protection philosophy of synthesis of low/overvoltage is wirelessly connected, have and improve anti-isolated island protection system
Economy and anti-isolated island protection sensitivity and reliability the characteristics of.
To achieve these goals, the present invention is to realize by the following technical solutions：
A kind of anti-isolated island protection system of the present invention, including station domain isolated island detecting device, channel radio in transformer station
Letter system and the anti-isolated island protection device in distributed power generation station；The station domain isolated island detecting device, for gathering power transformation
Each circuit breaker position in standing, detect whether public electric wire net dead electricity and forms isolated island in real time, and sent by wireless communication system
Message is to anti-isolated island protection device；The wireless communication system includes transformer station's wireless router, distributed power generation station without circuit
By device and cordless communication network；The anti-isolated island protection device, receiving station's domain isolated island is transmitted by the wireless communication system and examined
The communication message that device is sent is surveyed, gathers voltage and frequency at the points of common connection of distributed power generation station, it is any below meeting
During condition：1) receive and wirelessly connect jump message；2) radio communication is normal, meets low/overfrequency and low/non-sensitive section of criterion of overvoltage；3)
Radio communication is abnormal, meets low/overfrequency and low/over-pressed sensitive section of criterion, controls points of common connection circuit breaker trip.
Above-mentioned low/overfrequency and low/non-sensitive section of criterion of overvoltage are：
(Upcc>Uov.set)∪(Upcc<Uuv.set)∪(fpcc>fof.set)∪(fpcc<fuf.set)
Wherein, UpccFor the voltage at points of common connection, fpccFor the frequency at points of common connection, Uov.setIt is non-for overvoltage
Sensitive section of definite value, Uuv.setFor low-voltage non-sensitive section of definite value, fof.setFor overfrequency non-sensitive section of definite value, fuf.setFor the non-spirit of low frequency
Quick section of definite value.
Above-mentioned low/overfrequency and low/over-pressed sensitive section of criterion are：
(Upcc>Uov.set_s)∪(Upcc<Uuv.set_s)∪(fpcc>fof.set_s)∪(fpcc<fuf.set_s)
Uov.set_sFor overvoltage sensitive section of definite value, Uuv.set_sFor low-voltage sensitive section of definite value, fof.set_sFor sensitive section of overfrequency
Definite value, fuf.set_sFor low-frequency sensitive section definite value；
Wherein, Uov.set>Uov.set_s, Uuv.set<Uuv.set_s, fof.set>fof.set_s,fuf.set<fuf.set_s。
Above-mentioned cordless communication network includes 3G, 4G network.
The guard method of the anti-isolated island protection system of the present invention, specifically includes following steps：
(1) each circuit breaker position in the station domain isolated island detecting device collection transformer station, when any open circuit in transformer station
When device is changed into point position from closing position, then judges whether dead electricity and form isolated island (this method is prior art, and here is omitted), if
There is isolated island to form the then company of transmission and jump message to transformer station's wireless router；
(2) message that transformer station's wireless router transparent transmission station domain isolated island detecting device is sent, if can without even message is jumped
Hair, a heartbeat message is sent to distributed power generation station wireless router every cycle T；
(3) distributed power generation station wireless router receives transformer station's wireless router transparent transmission by cordless communication network
Message, and send to anti-isolated island protection device；
(4) whether the anti-isolated island protection device detection radio communication is normal, if can not receive heartbeat report more than time T+ t
Text, then radio communication exception is judged to, it is normal to be otherwise judged to radio communication；
(5) if radio communication is normal, the anti-isolated island protection device detects whether that receiving station domain isolated island detecting device sends
Company jump message, if receiving, trip commonly connected point breaker；If not receiving, using low/overfrequency and low/non-spirit of overvoltage
Quick section of criterion carries out island state differentiation, if meeting low/overfrequency and low/non-sensitive section of criterion of overvoltage, trips commonly connected
Point breaker, if be unsatisfactory for, turn to step (4)；If radio communication is abnormal, sentenced using low/overfrequency and low/sensitive section of overvoltage
According to island state differentiation is carried out, if meeting low/overfrequency and low/over-pressed sensitive section of criterion, trip commonly connected point breaker,
If be unsatisfactory for, step (4) is turned to.
In step (2), cycle T takes 0.5s~5s.
In step (4), t take 1s~2s.
The present invention is formed anti-isolated island and protected by domain isolated island detecting device of standing, wireless communication system, anti-isolated island protection device
System.Using wirelessly jump principle is connected, overcome conventional fiber and even jump the problem of less economical；Using based on wirelessly connecting jump, low/mistake
Frequency and the anti-isolated island protection philosophy of synthesis of low/overvoltage, the detection for both having solved the anti-isolated island protection based on voltage to frequency principle are blind
Area's problem also overcomes even jumps the problem of principle is because of communication disruption relay fail using single wireless；The anti-orphan of voltage to frequency principle
Island protection includes low/overfrequency and low/sensitive section of overvoltage and non-sensitive section of criterion, and it is sensitive to solve the anti-isolated island protection of traditional passive type
Contradiction between property and reliability.
Brief description of the drawings
Fig. 1 is the principle schematic that a kind of anti-isolated island provided in an embodiment of the present invention protects system；
Fig. 2 is a kind of workflow diagram of anti-isolated island guard method provided in an embodiment of the present invention；
Fig. 3 is sensitive section provided in an embodiment of the present invention and non-sensitive section of definite value graph of a relation.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to
Embodiment, the present invention is expanded on further.
A kind of anti-isolated island protection system embodiment provided by the invention, as shown in figure 1, a kind of anti-isolated island protection system includes
Stand domain isolated island detecting device, wireless communication system, anti-isolated island protection device, wherein：Domain isolated island detecting device of standing is located at transformer station
It is interior, gather main transformer high side switch DL1, DL2, DL3 position of the switch in transformer station, main transformer low-pressure side switch DL4, DL5 and institute
There are feeder switch F1, F2, Fn positions, detect whether public electric wire net dead electricity and produces isolated island in real time；Wireless communication system includes 3G/
4G wireless routers and 3G/4G public networks.
Anti- isolated island protection device is located in distributed power generation station, gathers the voltage of distributed power station points of common connection and can control
Make grid-connected switch separating brake；Anti- isolated island protection device includes is protected based on the anti-isolated island of synthesis for wirelessly connecting jump and low/overfrequency and low/overvoltage
Protect principle；The communication message that anti-isolated island protection device is sent by receiving station of radio communication system domain isolated island detecting device.
A kind of anti-isolated island guard method embodiment provided by the invention, step are as follows：
(1) domain isolated island detecting device of standing gathers main transformer high side switch DL1, DL2, DL3 position of the switch, main transformer in transformer station
Low-side switch DL4, DL5 and all feeder switch F1, F2, Fn positions, when meeting following either condition, send message extremely
3G/4G transformer stations wireless router.
Condition 1：DL6, DL4 are dividing position；
Condition 2：DL6, DL1, DL3 are dividing position；
Condition 3：DL4, DL5 are dividing position；
Condition 4：DL1, DL2 are dividing position；
Condition 5：F1 is dividing position；
(2) message that transformer station's wireless router transparent transmission station domain isolated island detecting device is sent, if can be sent out without message, per every other week
Phase T sends a heartbeat message to distributed power generation station wireless router, cycle T and takes 0.5s~5s；
(3) distributed power generation station wireless router receives the message of transformer station's wireless router transparent transmission simultaneously by public network
Send to anti-isolated island and protect；
(4) whether anti-isolated island protection device detection radio communication is normal, if can not receive heartbeat message more than time T+ t,
Radio communication exception is judged to, it is normal to be otherwise judged to radio communication.T typically take 1s~2s.
(5) such as Fig. 2 flow charts, if radio communication is normal, detect whether that receiving the company that station domain isolated island detecting device is sent jumps
Message, if receiving, trip commonly connected point breaker, if confiscating, is entered using low/overfrequency and low/non-sensitive section of criterion of overvoltage
Row island state differentiates；If radio communication is abnormal, island state differentiation is carried out using low/overfrequency and low/sensitive section of criterion of overvoltage.
Voltage to frequency criterion is：
(Upcc>Uov.set)∪(Upcc<Uuv.set)∪(fpcc>fof.set)∪(fpcc<fuf.set)
Wherein UpccFor the voltage at points of common connection, fpccFor the frequency at points of common connection, Uov.setFor the non-spirit of overvoltage
Quick section of definite value, Uuv.setFor low-voltage non-sensitive section of definite value, fof.setFor overfrequency non-sensitive section of definite value, fuf.setIt is non-sensitive for low frequency
Section definite value；
Sensitive section of criterion of voltage to frequency be：
(Upcc>Uov.set_s)∪(Upcc<Uuv.set_s)∪(fpcc>fof.set_s)∪(fpcc<fuf.set_s)
Uov.set_sFor overvoltage sensitive section of definite value, Uuv.set_sFor low-voltage sensitive section of definite value, fof.set_sFor sensitive section of overfrequency
Definite value, fuf.set_sFor low-frequency sensitive section definite value；
As shown in figure 3, Uov.set>Uov.set_s, Uuv.set<Uuv.set_s, fof.set>fof.set_s,fuf.set<fuf.set_s。
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of anti-isolated island protection system, it is characterised in that including station domain isolated island detecting device, the channel radio in transformer station
Letter system and the anti-isolated island protection device in distributed power generation station；The station domain isolated island detecting device, for gathering power transformation
Each circuit breaker position in standing, detect whether public electric wire net dead electricity and forms isolated island in real time, and sent by wireless communication system
Message is to anti-isolated island protection device；The wireless communication system includes transformer station's wireless router, distributed power generation station without circuit
By device and cordless communication network；The anti-isolated island protection device, receiving station's domain isolated island is transmitted by the wireless communication system and examined
The communication message that device is sent is surveyed, gathers voltage and frequency at the points of common connection of distributed power generation station, it is any below meeting
During condition：1) receive and wirelessly connect jump message；2) radio communication is normal, meets low/overfrequency and low/non-sensitive section of criterion of overvoltage；3)
Radio communication is abnormal, meets low/overfrequency and low/over-pressed sensitive section of criterion, controls points of common connection circuit breaker trip；
Low/the overfrequency and low/non-sensitive section of criterion of overvoltage are：
(Upcc>Uov.set)∪(Upcc<Uuv.set)∪(fpcc>fof.set)∪(fpcc<fuf.set)
Wherein, UpccFor the voltage at points of common connection, fpccFor the frequency at points of common connection, Uov.setIt is non-sensitive for overvoltage
Section definite value, Uuv.setFor low-voltage non-sensitive section of definite value, fof.setFor overfrequency non-sensitive section of definite value, fuf.setFor non-sensitive section of low frequency
Definite value.
2. anti-isolated island protection system according to claim 1, it is characterised in that the low/overfrequency and low/sensitive section of overvoltage
Criterion is：
(Upcc>Uov.set_s)∪(Upcc<Uuv.set_s)∪(fpcc>fof.set_s)∪(fpcc<fuf.set_s)
Uov.set_sFor overvoltage sensitive section of definite value, Uuv.set_sFor low-voltage sensitive section of definite value, fof.set_sIt is fixed for sensitive section of overfrequency
Value, fuf.set_sFor low-frequency sensitive section definite value；
Wherein, Uov.set>Uov.set_s, Uuv.set<Uuv.set_s, fof.set>fof.set_s,fuf.set<fuf.set_s。
3. anti-isolated island protection system according to claim 1, it is characterised in that the cordless communication network includes 3G, 4G
Network.
4. the guard method of anti-isolated island protection system according to claim 1, it is characterised in that specifically include following step
Suddenly：
(1) it is described station domain isolated island detecting device collection transformer station in each circuit breaker position, when in transformer station any breaker by
When closing position and being changed into point position, then judge whether dead electricity and form isolated island, if having isolated island formation the company of transmission jump message to transformer station without
Line router；
(2) message that transformer station's wireless router transparent transmission station domain isolated island detecting device is sent, if can be sent out without message is even jumped, often
A heartbeat message is sent to distributed power generation station wireless router every cycle T；
(3) distributed power generation station wireless router receives the report of transformer station's wireless router transparent transmission by cordless communication network
Text, and send to anti-isolated island protection device；
(4) whether the anti-isolated island protection device detection radio communication is normal, if can not receive heartbeat message more than time T+ Δ t,
Radio communication exception is then judged to, it is normal to be otherwise judged to radio communication；
(5) if radio communication is normal, the anti-isolated island protection device detects whether to receive the company that station domain isolated island detecting device is sent
Message is jumped, if receiving, trip commonly connected point breaker；If not receiving, using low/overfrequency and low/non-sensitive section of overvoltage
Criterion carries out island state differentiation, if meeting low/overfrequency and low/non-sensitive section of criterion of overvoltage, trip commonly connected point off
Road device, if be unsatisfactory for, turn to step (4)；If radio communication is abnormal, entered using low/overfrequency and low/over-pressed sensitive section of criterion
Row island state differentiates that, if meeting low/overfrequency and low/over-pressed sensitive section of criterion, trip commonly connected point breaker, if
It is unsatisfactory for, then turns to step (4).
5. anti-isolated island guard method according to claim 4, it is characterised in that in step (2), cycle T takes 0.5s~5s.
6. anti-isolated island guard method according to claim 4, it is characterised in that in step (4), Δ t takes 1s~2s.
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| CN107064678A (en) * | 2017-04-06 | 2017-08-18 | 国网安徽省电力公司芜湖供电公司 | A kind of island detection method based on electric power wireless private network |
| CN107294128B (en) * | 2017-06-01 | 2020-04-21 | 南京南瑞继保电气有限公司 | Distributed power supply comprehensive anti-islanding protection system and method |
| CN109066757A (en) * | 2018-08-03 | 2018-12-21 | 南京南瑞继保电气有限公司 | Multi-end flexible direct current transmission system judges the method and device of converter station operating status |
| CN116054106B (en) * | 2023-03-15 | 2023-06-30 | 国网浙江省电力有限公司 | Low-voltage distribution network cooperative anti-islanding protection system, method and related equipment |
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