CN106684927A - Grid-connected system for large generator sets in isolated grid system and grid-connected method - Google Patents
Grid-connected system for large generator sets in isolated grid system and grid-connected method Download PDFInfo
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- CN106684927A CN106684927A CN201710202440.9A CN201710202440A CN106684927A CN 106684927 A CN106684927 A CN 106684927A CN 201710202440 A CN201710202440 A CN 201710202440A CN 106684927 A CN106684927 A CN 106684927A
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- station
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- generating set
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a grid-connected system for large generator sets in an isolated grid system and a grid-connected method. The grid-connected system comprises a first-station C-section bus coupler, wherein the first-station C-section bus coupler is connected with a first-station CI bus and a first-station CII bus; a second-station bus is connected to the first-station CI bus and the first-station CII bus by an interconnecting transformer; a high-voltage-side switch and a low-voltage-side grid-connected point switch are respectively arranged at the two sides of the interconnecting transformer; a first generator set to be grid-connected is connected to the second-station bus by a first grid-connected point switch, and a second generator set to be grid-connected is connected to the second-station bus by a second grid-connected point switch; the second-station bus adopts a dual-bus and dual-section wiring mode; and the grid of the first station is an isolated grid. The grid-connected method disclosed by the invention has the advantages that the serious consequence of breakdown possibly caused to the grid in the impact process of the interconnecting network is avoided, the sets are grid-connected successfully, no abnormal fluctuation of the grid is guaranteed, and the safe operation of the isolated grid system is ensured, so that the direct economic benefit can not be estimated.
Description
Technical field
The present invention relates to the grid-connected field of generating set, more particularly to a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System
And combination method.
Background technology
In order to improve power supply quality, generating set is all the operation that is connected to the grid.Need to meet four conditions when being connected to the grid：
(1) frequency of generator is identical with mains frequency；(2) generator is identical with the voltage waveform of power network；(3) generator and power network electricity
Pressure size and phase are identical；(4) phase sequence of generator and power network is identical.
The method of generator connecting in parallel with system has quasi-synchronizing method and self-synchronizing method.Present Generator Set is grid-connected generally using accurate same
Footwork.Quasi-synchronizing method is exactly that accurate synchronization method, i.e. operating personnel are monitored using synchro indicator, will treat and generator is adjusted to
Just it is connected to the grid after stating grid-connected condition.This method is strict but small to the dash current of motor to grid-connected conditions requirement.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, there is provided a kind of grid-connected system of the medium-and-large-sized generating set of Isolated Network System
System and combination method, stepping up from zero is become using the contact of generating set band, and medium voltage side simultaneous interconnecting is become by getting in touch with, and perfection is solved
Transformer impact may cause the problem that power network is paralysed.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of medium-and-large-sized generating set grid-connected system of Isolated Network System, including first stop C sections of mother, described first stop C sections female
Connection connection first stop CI buses and first stop CII buses；Second station bus is connected to the first stop CI by connecting transformer
Bus and first stop CII buses, connecting transformer be respectively provided on two sides with high side switch and low-pressure side grid entry point switch；Treat simultaneously
The generating set of net first is switched and to the second station bus by the first grid entry point, treats that grid-connected second generating set passes through second
Grid entry point is switched and to the second station bus；The second station bus is using double female double section wiring modes；
Power network residing for first stop is isolated network；Low-pressure side grid entry point switch, the first grid entry point switch and the second grid entry point switch
Both sides voltage, the position contact of each switch correspond to access a synchronous device for generator respectively；First generating set, the second hair
Group of motors and second station bus all access G-T protective cabinet；Connecting transformer and second station bus all access connecting transformer guarantor
Shield cabinet.
Voltage of the first stop C sections of voltage of mother less than second station bus.
The first stop C sections of voltage of mother is 220KV, the voltage 500KV of second station bus.
The first stop C sections of mother connects the first stop CII buses by first stop CII buses isolation switch, described
First stop C sections of mother connects the first stop CI buses by first stop CI buses isolation switch.
The second station bus includes second station A sections of mother, second station BI buses and second station BII buses, described second
A sections of mother of standing is connected respectively to second station AI buses and second station AII buses by switch；The second station BI buses are by the
Two station AI busbar sectional izing switch connection second station AI buses, the second station BII buses pass through second station AII busbar sectional izing switches
Connection second station AII buses.
The second station A sections of mother has been also respectively connected near the both sides of second station AI buses and second station AII buses
Second station A sections of mother AI bus grounding disconnecting link and second station A sections of mother AII bus grounding disconnecting link.
Using a kind of combination method of the medium-and-large-sized generating set grid-connected system of Isolated Network System, including,
Step one, first stop CII buses are not charged, and the first generating set or the second generating set are with second station bus, connection
Network transformer and first stop CII bus stepping up from zero；
Step 2, synchronous device for generator is come into operation, and following grid-connected step is carried out in same period point；
Step 3, respectively measuring system side voltage with treat and side voltage magnitude and carry out nuclear phase, after nuclear phase is correct, the first hair
Group of motors or the second generating set demagnetization, disconnect low-pressure side grid entry point switch, are filled from external power grid system to first stop CII buses
Electricity；
Step 4, the first generating set or the second generating set band second station bus, connecting transformer stepping up from zero, with low
Pressure side grid entry point switch is grid-connected first；
Step 5, checks input after related protection normally after connecting transformer is grid-connected, low-pressure side grid entry point switch no longer breaks
Open, second station bus is connected by connecting transformer with first stop isolated network；
Step 6, disconnects the first grid entry point switch, and the first generating set is re-started grid-connected by the first grid entry point switch
Experiment, or the second grid entry point switch is disconnected, the second generating set is switched by the second grid entry point and re-starts grid connection test.
In the step 2, when the first generating set or the second generating set voltage rise to rated voltage, hair
Motor synchronous device comes into operation.
The step 3 comprises the concrete steps that the first generating set or the second generating set G-T protective cabinet be to second station
Bus and the first generating set or the second generating set set end voltage carry out nuclear phase；Connecting transformer protects cabinet to connecting transformer
Medium voltage side voltage carries out nuclear phase with second station bus.
In the step 4, when the first generating set or the second generating set voltage are raised to rated voltage with low-pressure side simultaneously
Site switch is grid-connected first.
Beneficial effects of the present invention：
(1) this approach avoid the serious consequence for being likely to result in paralysis in contact change impact process to power network；
(2) make unit success grid-connected, it is ensured that power network fluctuation without exception, ensured the safe operation of Isolated Network System, its is direct
Economic benefit is unable to estimate.
Brief description of the drawings
Fig. 1 is grid-connected system wiring schematic diagram of the present invention；
Wherein, 1.220kV first stops CI buses, 2.220kV first stop CII buses, 3. low-pressure side grid entry point switch, 4. connection
Network transformer, 5. high side switch, 6.500kV second station AI buses, 7.500kV second station AII buses, 8. the first generator
Group, 9. the first grid entry point switch, A sections of mother of 10.500kV second stations, A sections of mother AI busbar grounding knife of 11.500kV second stations
Lock, A sections of mother AII bus grounding disconnecting link of 12.500kV second stations, 13. second grid entry points switch, 14. second generating sets,
15.500kV second station AII busbar sectional izing switches, 16.500kV second station AI busbar sectional izing switches, C sections of 17.220kV first stops
Mother CII bus isolation switch, C sections of mother of 18.220kV first stops, C sections of mother CI bus isolation knife of 19.220kV first stops
Lock, 20.500kV second station BI buses, 21,500kV second station BII buses.
Specific embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System, including first stop C sections of mother (220kV
First stop C sections of mother 18), C sections of mother 18 of 220kV first stops connects first stop CI buses (220kV first stop CI buses 1) and the
One station CII buses (220kV first stop CII buses 2)；Second station bus is connected to 220kV first stops CI by connecting transformer 4
Bus 1 and 220kV first stop CII buses 2, connecting transformer 4 are respectively provided on two sides with high side switch 5 and low-pressure side grid entry point
Switch 3；Treat that grid-connected first generating set 8 switchs 9 and to the second station bus by the first grid entry point, treat that grid-connected second generates electricity
Unit 14 switchs 13 and arrives the second station bus by the second grid entry point；The second station bus is using double female double section wirings
Mode；
Low-pressure side grid entry point switch, the first grid entry point switch and the second grid entry point switch both sides voltage, the position of each switch
Put contact and correspond to one synchronous device for generator of access respectively；First generating set, the second generating set and second station bus are all
Access G-T protective cabinet；Connecting transformer and second station bus all access connecting transformer protection cabinet.
C sections of mother 18 of 220kV first stops connects 220kV by C sections of mother CII buses isolation switch 17 of 220kV first stops
First stop CII buses 2, C sections of mother 18 of 220kV first stops is connected by C sections of mother CI buses isolation switch 19 of 220kV first stops
220kV first stop CI buses 1.
Second station bus includes second station A sections of mother (A sections of mother 10 of 500kV second stations), second station BI buses (500kV
Second station BI buses 20) and second station BII buses (500kV second station BII buses 21), A sections of mother 10 of 500kV second stations passes through
Switch is connected respectively to second station AI buses (500kV second station AI buses 6) and second station AII buses (500kV second stations AII
Bus 7)；500kV second station BI buses 20 pass through second station AI busbar sectional izing switches (500kV second station AI busbar sectional izing switches
16) connection 500kV second station AI buses 6,500kV second station BII buses 21 pass through second station AII busbar sectional izing switches (500kV
Second station AII busbar sectional izing switches 15) connection second station AII buses (500kV second station AII buses 7).
A sections of mother 10 of 500kV second stations is near the two of 500kV second station AI buses 6 and 500kV second station AII buses 7
Side has been also respectively connected with second station A sections of mother AI bus grounding disconnecting link (A sections of mother AI bus grounding disconnecting link 11 of 500kV second stations)
With second station A sections of mother AII bus grounding disconnecting link (A sections of mother AII bus grounding disconnecting link 12 of 500kV second stations).
The rated capacity of connecting transformer 4 is 1200MW, and power network residing for 220kV first stops is isolated network, and online load is no more than
4000MW.So that the first generating set 8 wants grid-connected as an example, it is according to conventional scheme：First by 220kV first stops to connecting transformer
4 carry out 5 Secondary Shocks experiments, and charge test is carried out to 500kV buses after the completion of impact test, after 500kV buses are powered, the first hair
Group of motors 8 switchs 9 and is incorporated to 500kV buses by the first grid entry point.Directly connecting transformer 4 is entered by 220kV first stops isolated network
Row impact, excitation surge current can produce substantial amounts of harmonic wave in transformer impact process, cause line voltage rapid drawdown, for electrically setting
Standby stable operation produces certain influence, while consider that isolated network capacity is smaller, and it is larger to get in touch with varying capacity, 220kV first
Voltage of standing has larger fluctuation, there is larger threat to power network and results even in power network paralysis, causes serious economic loss.
So that the first generating set 8 wants grid-connected as an example, combination method specific implementation step of the invention is：
(1) the 220kV sides of connecting transformer 4 set a same period point, i.e., low-pressure side grid entry point switch 3 as one simultaneously
Site, switchs low-pressure side grid entry point 3 both sides voltages, position contact and introduces synchronous device for generator；
(2) 220kV first stop CII buses 2 are vacated；
(3) first generating sets 8 are with A sections of 500kV second stations, connecting transformer 4,220kV first stop CII buses 2 zero
Boosting；
The voltage of (4) first generating set 8 rises to 220kV, puts into two synchronous devices, checks automatic sub-synchronous device synchronization
Indicator carries out following combination method in same period point, and following grid-connected step cannot not then be carried out in same period point；
(5) respectively measuring system side voltage with treat and side voltage magnitude, and carry out nuclear phase；Particularly：Generated electricity first
The G-T protective cabinet of unit 8 carries out nuclear phase to 500kV second station AI buses and the generator terminal voltage of the first generating set 8；
Nuclear phase is carried out to connecting transformer medium voltage side voltage and 500kV second station AI busbar voltages in the protection cabinet of connecting transformer 4；
(6) after nuclear phase is correct, eliminating magnetism of generator disconnects low-pressure side grid entry point switch 3, from external power grid system to 220kV the
One station CII busbar chargings；
(7) first generating sets 8 treat the first generator with 500kV second station AI buses, the stepping up from zero of connecting transformer 4
8 generator voltages of group are raised to grid-connected first with low-pressure side grid entry point switch 3 during rated voltage；
(9) input after related protection normally is checked after connecting transformer 4 is grid-connected, low-pressure side grid entry point switch 3 no longer disconnects,
500kV second stations are connected by connecting transformer 4 with 220kV first stop isolated networks；
(10) the first grid entry point switch 9 is disconnected, first grid entry point of the first generating set 8 switchs 9 and re-starts grid-connected examination
Test.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. the medium-and-large-sized generating set grid-connected system of a kind of Isolated Network System, it is characterized in that, including first stop C sections of mother, described first
C sections of mother of standing connects first stop CI buses and first stop CII buses；Second station bus is connected to described by connecting transformer
One station CI buses and first stop CII buses, connecting transformer be respectively provided on two sides with high side switch and low-pressure side grid entry point is opened
Close；Treat that grid-connected first generating set is switched and to the second station bus by the first grid entry point, treat grid-connected second generating set
Switched by the second grid entry point and to the second station bus；The second station bus is using double female double section wiring modes；
Power network residing for first stop is isolated network；Low-pressure side grid entry point switch, the first grid entry point switch and the second grid entry point switch each
Both sides voltage, the position contact of switch correspond to access a synchronous device for generator respectively；First generating set, the second generator
Group and second station bus all access G-T protective cabinet；Connecting transformer and second station bus all access connecting transformer protection
Cabinet.
2. as claimed in claim 1 a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System, it is characterized in that, first stop C section mother
Voltage of the voltage of connection less than second station bus.
3. as claimed in claim 1 a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System, it is characterized in that, first stop C section mother
The voltage of connection is 220KV, the voltage 500KV of second station bus.
4. as claimed in claim 1 a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System, it is characterized in that, the first stop C
Section mother connects the first stop CII buses by first stop CII buses isolation switch, and the first stop C section mother passes through the
One station CI buses isolation switch connects the first stop CI buses.
5. a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System as claimed in claim 1, it is characterized in that, the second station is female
Line includes second station A sections of mother, second station BI buses and second station BII buses, and the second station A sections of mother is distinguished by switching
It is connected to second station AI buses and second station AII buses；The second station BI buses are connected by second station AI busbar sectional izing switches
Second station AI buses are connect, the second station BII buses connect second station AII buses by second station AII busbar sectional izing switches.
6. as claimed in claim 5 a kind of medium-and-large-sized generating set grid-connected system of Isolated Network System, it is characterized in that, the second station A
Section mother is being also respectively connected with second station A sections of mother AI bus near the both sides of second station AI buses and second station AII buses
Grounding switch and second station A sections of mother AII bus grounding disconnecting link.
7. using a kind of combination method of the medium-and-large-sized generating set grid-connected system of Isolated Network System described in claim 1, it is characterized in that,
Including,
Step one, first stop CII buses are not charged, and the first generating set or the second generating set band second station bus, contact become
Depressor and first stop CII bus stepping up from zero；
Step 2, synchronous device for generator is come into operation, and following grid-connected step is carried out in same period point；
Step 3, respectively measuring system side voltage with treat and side voltage magnitude and carry out nuclear phase, after nuclear phase is correct, the first generator
Group or the second generating set demagnetization, disconnect low-pressure side grid entry point switch, from external power grid system to first stop CII busbar chargings；
Step 4, the first generating set or the second generating set band second station bus, connecting transformer stepping up from zero, use low-pressure side
Grid entry point switch is grid-connected first；
Step 5, checks input after related protection normally after connecting transformer is grid-connected, low-pressure side grid entry point switch no longer disconnects, the
Two station buses are connected by connecting transformer with first stop isolated network；
Step 6, disconnects the first grid entry point switch, and the first generating set is switched by the first grid entry point and re-starts grid connection test,
Or the second grid entry point switch is disconnected, the second generating set is switched by the second grid entry point and re-starts grid connection test.
8. combination method as claimed in claim 7, it is characterized in that, in the step 2, when the first generating set or second send out
When group of motors voltage rises to rated voltage, synchronous device for generator comes into operation.
9. combination method as claimed in claim 7, it is characterized in that, the step 3 is comprised the concrete steps that, the first generating set
Or second generating set G-T protective cabinet second station bus is entered with the first generating set or the second generating set set end voltage
Row nuclear phase；Connecting transformer protection cabinet carries out nuclear phase to connecting transformer medium voltage side voltage and second station bus.
10. combination method as claimed in claim 7, it is characterized in that, in the step 4, treat the first generating set or the second hair
Group of motors voltage is raised to grid-connected first with low-pressure side grid entry point switch during rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710202440.9A CN106684927B (en) | 2017-03-30 | 2017-03-30 | A kind of medium-and-large-sized generating set grid-connected system of Isolated Network System and combination method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710202440.9A CN106684927B (en) | 2017-03-30 | 2017-03-30 | A kind of medium-and-large-sized generating set grid-connected system of Isolated Network System and combination method |
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| CN106684927A true CN106684927A (en) | 2017-05-17 |
| CN106684927B CN106684927B (en) | 2019-04-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887931A (en) * | 2017-12-25 | 2018-04-06 | 国投钦州发电有限公司 | The more same period point auto-parallel systems of generating set |
| CN108092312A (en) * | 2017-12-25 | 2018-05-29 | 中国能源建设集团华东电力试验研究院有限公司 | The mating interim a whole set of activation system exported under engineering does not complete |
| CN109932601A (en) * | 2019-03-31 | 2019-06-25 | 上海二十冶建设有限公司 | The method that the grid-connected circuit of star-like statodyne group is detected with anti-power transmission |
| CN113325236A (en) * | 2021-07-02 | 2021-08-31 | 山东钢铁股份有限公司 | Power transmission phase checking method for double-bus double-section wiring GIS cabinet power supply |
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| CN101136550A (en) * | 2007-08-10 | 2008-03-05 | 南京汽轮电机(集团)有限责任公司 | Gas turbine generator synchronous voltage extracting method |
| CN202888865U (en) * | 2012-07-27 | 2013-04-17 | 大唐华银电力股份有限公司 | Unit synchronization system provided with synchronization block relay |
| CN203481825U (en) * | 2013-09-30 | 2014-03-12 | 中国电力工程顾问集团西南电力设计院 | Optimized natural gas distribution-type energy main wiring circuit |
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| US20020104827A1 (en) * | 2001-02-07 | 2002-08-08 | Toshiaki Rokunohe | Gas insulated switchgear |
| CN1899025A (en) * | 2006-06-30 | 2007-01-24 | 丁国强 | Ecological sand industry garden complex system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887931A (en) * | 2017-12-25 | 2018-04-06 | 国投钦州发电有限公司 | The more same period point auto-parallel systems of generating set |
| CN108092312A (en) * | 2017-12-25 | 2018-05-29 | 中国能源建设集团华东电力试验研究院有限公司 | The mating interim a whole set of activation system exported under engineering does not complete |
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| CN109932601A (en) * | 2019-03-31 | 2019-06-25 | 上海二十冶建设有限公司 | The method that the grid-connected circuit of star-like statodyne group is detected with anti-power transmission |
| CN113325236A (en) * | 2021-07-02 | 2021-08-31 | 山东钢铁股份有限公司 | Power transmission phase checking method for double-bus double-section wiring GIS cabinet power supply |
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| Publication number | Publication date |
|---|---|
| CN106684927B (en) | 2019-04-02 |
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