CN107887931A - The more same period point auto-parallel systems of generating set - Google Patents
The more same period point auto-parallel systems of generating set Download PDFInfo
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- CN107887931A CN107887931A CN201711419496.6A CN201711419496A CN107887931A CN 107887931 A CN107887931 A CN 107887931A CN 201711419496 A CN201711419496 A CN 201711419496A CN 107887931 A CN107887931 A CN 107887931A
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- 238000005259 measurement Methods 0.000 claims abstract description 25
- 230000001360 synchronised effect Effects 0.000 claims abstract description 18
- 230000009471 action Effects 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
-
- 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
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of more same period point auto-parallel systems of generating set, by being mounted on system side voltage measurement unit on I bus, II bus and each user's line for being connected on I, II bus, generating set is when grid-connected, by on generator treat and side voltage measurement unit is sensed with wherein any one system side voltage measurement unit, when meeting simultaneous interconnecting condition, cutting-in control unit is controlled in synchronous device, cutting-in control unit is opened each grid-connected disconnecting link/switch successively.Compared with prior art, as long as any one same period point in network system is normal, the paired running of generator can be achieved, substantially increase the grid connection efficiency of generating set, ensure that the stable operation for distribution in system side；The row swithes that the present invention is used to perform grid-connected action simultaneously are 2 so that one of row swithes failure in the system, the grid-connected of generator is nor affected on, and it is grid-connected more convenient and flexible in the selection of branch road.
Description
Technical field
The present invention relates to a kind of generating set auto-parallel device, and in particular to the more same period point auto-parallel systems of generating set
System.
Background technology
In power plant, simultaneous interconnecting is a great operation before power plants generating electricity.Excitation, steam turbine, disconnecting link is needed to open
Cooperation between each systems such as pass, DCS controls, finally realizes that generator stable is connected to the grid, stable electric power is sent into power network.
Once misoperation, the abnormal accidents such as system fluctuation, vibration may be caused, can be caused when serious generator asynchronous it is grid-connected, hair
Motor damage, the serious electrical accident of power network spring net.Generator synchronous grid-connected principle is：By gathering generator (or main transformer
High-pressure side) voltage of voltage transformer (i.e. PT) in outlet and the voltage ratio of system side compared with, when reach impose a condition when (including
During the conditions such as the voltage magnitudes of both sides, phase sequence, phase, frequency) reclosing command is sent, will by closing generator outlet breaker
Generator and system grid connection, realize electrical energy transportation.Generator synchronous grid-connected system is the key of generator and power network paired running
Equipment, the reliability of its function are most important.It is existing to have automatic synchronizing paralleling, same manually for generating set simultaneous interconnecting pattern
Phase is grid-connected and automatic presynchronization is grid-connected, but no matter which kind of grid-connect mode used, generating set and network process be configured with phase
The purpose that the synchronous device answered is automatically controlled with reaching.
As shown in figure 1, the partial electric connection figure of the conventional electric generators simultaneous interconnecting originally used for our company.From figure
It is not difficult to find out, exporting disconnecting link 20011 (illustrating by row of I buses) by transformer unit in system side is led to 220KVI buses PT
Automatic sub-synchronous device, i.e., as with treating that simultaneously side 1PT or 2PT carry out same period condition confirmation on generator.When grid-connected, when treating
And side PT voltage magnitude, phase sequence, phase, frequency with during all same, synchronous device can just send closure and generate electricity on bus PT
Machine exports the instruction of knife switch, could so complete the operation of generator connecting in parallel with system.Therefore, the PT in system side is also referred to as grid-connected
Same period point, there was only the same period point during traditional generator auto-parallel.The generating set auto-parallel of only one same period point
Although technology is connecting up and controlled relatively simple operation in operation, when PT or the generating set outlet being located in bus bar side
When switch tool breaks down, generator will terminate arranged side by side with system, need to wait for can carrying out after troubleshooting terminates grid-connected.This
Sample not only delays the set grid-connection time, make in system side for distribution fluctuation of service, reduce Business Economic Benefit；This
Outside, the outlet of generator only has a row swithes, and connected mode is single, grid-connected to use underaction.
The content of the invention
To overcome drawbacks described above, the technical problems to be solved by the invention be to provide it is a kind of with multiple separate and
The generating set auto-parallel system of same period point is netted, as long as the grid-connected system has one of them same period point normal work to can be achieved
Generating set it is grid-connected.
To reach above-mentioned purpose, the present invention is achieved through the following technical solutions：
The more same period point auto-parallel systems of generating set, including for generator synchronous grid-connected network system and for controlling
The synchronous device of network system auto-parallel, I bus that the network system includes being in parallel, II bus and it is connected on I bus, II
N subscriber lines on bus, the network system also include the cutting-in control unit corresponding with the quantity of user's line, one with
Branch where the output end of family line one cutting-in control unit of corresponding access, the input and generator outlet of cutting-in control unit
Road connects, and the cutting-in control unit is arranged on and controls generator between I bus and II bus and under the control of synchronous device
Perform grid-connected action；Be mounted on system side voltage measurement unit on I bus, II bus and each user's line, wherein n for >=
1 integer.
In such scheme, the cutting-in control unit may include a plug-in strip control unit, master control disconnecting link, secondary plug-in strip control
Unit, a row swithes and secondary row swithes processed, wherein
Branch road connection where one end of plug-in strip control unit and generator outlet, its other end are divided into two
Branch road：A wherein branch road is connected to after a row swithes on I bus, the input of another branch road and master switch connects
Connect；The output end of the master switch is divided into two branch roads：Wherein a branch road is connected to II after secondary plug-in strip control unit
Bus, another branch road are connected after secondary row swithes with corresponding user's line；On the branch road where generator outlet
Installation needs and side voltage measurement unit.
In such scheme, it is further preferred that the value of the n is 2, that is, there are 2 user's lines to be connected on I bus, on II bus.
Beneficial effects of the present invention are：
1) present invention on I bus, II bus and each user's line for being connected on I, II bus by being mounted on system
Side voltage measurement unit, generating set when grid-connected, by generator treat and side voltage measurement unit with it is wherein any one
Individual system side voltage measurement unit is sensed, and when meeting simultaneous interconnecting condition, cutting-in control unit is entered in synchronous device
Row control, so that cutting-in control unit opens each grid-connected disconnecting link/switch successively.Show with what an only same period point was sensed
There is simultaneous interconnecting device to compare, as long as any one same period point (system side voltage measurement unit) in network system is normally,
The paired running of generator can be achieved；And traditional interconnection technology can only be a same period point, once the same period point hair in system side
Raw failure will be unable to carry out generator and net operation.The grid connection efficiency of generating set will be greatly improved using grid-connected system,
And can guarantee that in system side for distribution stable operation, improve Business Economic Benefit；
2) row swithes for being used to perform grid-connected action in the cutting-in control unit designed in the present invention are 2 so that this
One of row swithes failure in system, the grid-connected of generator is nor affected on, and he it is grid-connected more square in the selection of branch road
Just and flexibly.
Brief description of the drawings
Fig. 1 is the partial electric connection figure of traditional 1 generating set auto-parallel.
When Fig. 2 is 3 same period points, the electrical connection diagram of 1 generating set auto-parallel.
When Fig. 3 is 3 same period points, the electrical connection diagram of 2 generating set auto-parallels.
1st, system side voltage measurement unit, 2, treat and side voltage measurement unit, 3, plug-in strip control units, 4, secondary lock
Knife control unit, 5, row swithes, 6, secondary row swithes, 7, master control disconnecting link, 8, cutting-in control unit.
Embodiment
Embodiment 1
The more same period point auto-parallel systems of generating set, including for generator synchronous grid-connected network system and for controlling
The synchronous device of network system auto-parallel.Composition and the same period used in the prior art in the synchronous device main body are simultaneously
Net device is the same.Except that：Each electrically detection component, control chopper switch on the improved cutting-in control unit 8 of institute
The increase and connection of adaptability are done, and does adaptable logic control instruction in controller on synchronous device and improves.The electricity
I bus that net system includes being in parallel, II bus and it is connected on I bus, the n subscriber lines on II bus.
The network system also includes the cutting-in control unit 8 corresponding with the quantity of user's line.As shown in Fig. 2 it is one
Electrical connection diagram corresponding to subscriber lines during one group of generator connecting in parallel with system, i.e. n=1.The corresponding access one of one subscriber lines is grid-connected
Branch road connection where the output end of control unit 8, the input and generator outlet of cutting-in control unit 8.Described and network control
Unit 8 processed is arranged between I bus and II bus and controls generator to perform grid-connected action under the control of synchronous device.
System side voltage measurement unit 1 is mounted on I bus, II bus and each user's line.The system side voltage measurement unit 1
The same period point of PT points as in network system, specially generator connecting in parallel with system.It is not difficult to find out from Fig. 2, even if on two buses
User's line is only connected to, also there are 3 same period points in this simultaneous interconnecting system, is in I bus, II bus and user's line successively
On.
In the present embodiment, the cutting-in control unit 8 includes a plug-in strip control unit 3, master control disconnecting link 7, secondary plug-in strip
4, row swithes 5 of control unit and secondary row swithes 6.One end of plug-in strip control unit 3 goes out with generator
Branch road connection where mouthful, its other end are divided into two branch roads：It is female that a wherein branch road is connected to I after a row swithes 5
On line, the input of another branch road and master switch connects.The output end of the master switch is divided into two branch roads：Wherein one
Bar branch road be connected to after secondary plug-in strip control unit 4 II bus, another branch road after secondary row swithes 6 with it is corresponding
User's line connects.Installation needs simultaneously side voltage measurement unit 2 on the branch road where generator outlet, treats simultaneously side voltage measurement list
Member 2 is on installation generator outlet and the PT corresponding with the PT points in system side.
Said system side voltage measurement unit 1 and treat and side voltage measurement unit 2 be specifically existing structure voltage it is mutual
Sensor and supporting electric components.
4, row swithes 5 of a plug-in strip control unit 3, master control disconnecting link 7, secondary plug-in strip control unit of above-mentioned use
Model, quantity and the composition of the electrical equipment used with secondary row swithes 6 enter according to the magnitude of voltage on I bus, II bus
Row selection.
The present invention is when in use：1) when on the system side voltage measurement unit 1 on I bus and II bus and two buses
Each way switch disconnecting link it is normal when, treat and side voltage measurement unit 2 preferentially with the system side voltage measurement unit 1 on I bus
Carry out correspondingly, when the parameter obtained after corresponding mutual inductance meets the condition of simultaneous interconnecting, lock of synchronous device remote control
3, row swithes 5 of knife control unit, master switch and secondary plug-in strip control unit 4 are opened, and generator performs and net operation；
2) when the switch tool on the system side voltage measurement unit 1 or bus on I bus and II bus breaks down,
Treat and side voltage measurement unit 2 carries out corresponding with the system side voltage measurement unit 1 on user's line, obtained after corresponding mutual inductance
When parameter meets the condition of simultaneous interconnecting, 3, row swithes 5 of plug-in strip control unit of synchronous device remote control, master
Control switch, secondary plug-in strip control unit 4 and secondary row swithes 6 are opened, and generator performs and net operation.
Embodiment 2
As shown in figure 3, the more same period point auto-parallel systems of generating set and embodiment 1 except that, the n's
It is worth for 2.That is two user's lines are connected on I bus, on II bus, and have two generators to carry out simultaneous interconnecting in simultaneous interconnecting
There are 3 same period points in system, be on I bus, II bus and user's line successively.Certainly, distribution demand is supplied according to power network,
The user's line accessed on two buses can be multiple, therefore the same period point quantity where it in system side of simultaneous interconnecting also corresponds to
Increase, can further improve the reliability of simultaneous interconnecting.
Explanation embodiments of the present invention are these are only, are not intended to limit the invention, for those skilled in the art
For, within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in this hair
Within bright protection domain.
Claims (3)
1. the more same period point auto-parallel systems of generating set, including for generator synchronous grid-connected network system and for controlling electricity
The synchronous device of net system auto-parallel, I bus that the network system includes being in parallel, II bus and is connected on I bus, II female
N subscriber lines on line, it is characterised in that：The network system also includes the cutting-in control list corresponding with the quantity of user's line
First (8), the output end of a subscriber lines one cutting-in control unit (8) of corresponding access, the input of cutting-in control unit (8) with
Branch road connection where generator outlet, the cutting-in control unit (8) are arranged between I bus and II bus and in the same period
Control generator performs grid-connected action under the control of device；System side is mounted on I bus, II bus and each user's line
Voltage measurement unit (1), wherein n are >=1 integer.
2. the more same period point auto-parallel systems of generating set according to claim 1, it is characterised in that：The cutting-in control
Unit (8) includes a plug-in strip control unit (3), master control disconnecting link (7), secondary plug-in strip control unit (4), a row swithes
(5) and secondary row swithes (6), wherein the branch road where one end of the once plug-in strip control unit (3) and generator outlet
Connection, its other end are divided into two branch roads：A wherein branch road is connected on I bus after a row swithes (5), another
The input of branch road and master switch connects；The output end of the master switch is divided into two branch roads：Wherein a branch road is through two
Be connected to after secondary plug-in strip control unit (4) on II bus, another branch road after secondary row swithes (6) with corresponding user
Line connects；Installation needs simultaneously side voltage measurement unit (2) on the branch road where generator outlet.
3. the more same period point auto-parallel systems of generating set according to claim 1 or 3, it is characterised in that：The value of the n
For 2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721837373.XU CN207753464U (en) | 2017-12-25 | 2017-12-25 | The more same period point auto-parallel systems of generating set |
| CN201711419496.6A CN107887931A (en) | 2017-12-25 | 2017-12-25 | The more same period point auto-parallel systems of generating set |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721837373.XU CN207753464U (en) | 2017-12-25 | 2017-12-25 | The more same period point auto-parallel systems of generating set |
| CN201711419496.6A CN107887931A (en) | 2017-12-25 | 2017-12-25 | The more same period point auto-parallel systems of generating set |
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| CN107887931A true CN107887931A (en) | 2018-04-06 |
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| CN201711419496.6A Pending CN107887931A (en) | 2017-12-25 | 2017-12-25 | The more same period point auto-parallel systems of generating set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556875A (en) * | 2018-05-31 | 2019-12-10 | 深圳中广核工程设计有限公司 | Unit synchronization system for large power plant |
| CN111934353A (en) * | 2020-07-03 | 2020-11-13 | 华电电力科学研究院有限公司 | Method for obtaining false synchronization grid-connected signals of unit and optimizing synchronization grid-connected signals based on different wiring modes |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207753464U (en) * | 2017-12-25 | 2018-08-21 | 国投钦州发电有限公司 | The more same period point auto-parallel systems of generating set |
| CN110011353B (en) * | 2019-03-19 | 2022-12-27 | 上海唐银投资发展有限公司 | Parallel operation control system and method for diesel generator power supply and distribution system |
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| KR20010064511A (en) * | 1999-12-29 | 2001-07-09 | 김형국 | Test device for Generator automatic synchronizer |
| CN106099973A (en) * | 2016-06-29 | 2016-11-09 | 华能重庆两江燃机发电有限责任公司 | A kind of Rhizoma Sparganii M701F4 type 3 simultaneous interconnecting implementation methods of unit gas turbine transformer unit |
| CN106684927A (en) * | 2017-03-30 | 2017-05-17 | 山东中实易通集团有限公司 | Grid-connected system for large generator sets in isolated grid system and grid-connected method |
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2017
- 2017-12-25 CN CN201721837373.XU patent/CN207753464U/en active Active
- 2017-12-25 CN CN201711419496.6A patent/CN107887931A/en active Pending
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| KR20010064511A (en) * | 1999-12-29 | 2001-07-09 | 김형국 | Test device for Generator automatic synchronizer |
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| CN106684927A (en) * | 2017-03-30 | 2017-05-17 | 山东中实易通集团有限公司 | Grid-connected system for large generator sets in isolated grid system and grid-connected method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556875A (en) * | 2018-05-31 | 2019-12-10 | 深圳中广核工程设计有限公司 | Unit synchronization system for large power plant |
| CN111934353A (en) * | 2020-07-03 | 2020-11-13 | 华电电力科学研究院有限公司 | Method for obtaining false synchronization grid-connected signals of unit and optimizing synchronization grid-connected signals based on different wiring modes |
| CN111934353B (en) * | 2020-07-03 | 2022-07-05 | 华电电力科学研究院有限公司 | Method for obtaining false synchronization grid-connected signals of unit and optimizing synchronization grid-connected signals |
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| CN207753464U (en) | 2018-08-21 |
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