CN106849170A - A kind of method that flexible direct current power transmission system containing wind-powered electricity generation is turned grid-connect mode by isolated island - Google Patents
A kind of method that flexible direct current power transmission system containing wind-powered electricity generation is turned grid-connect mode by isolated island Download PDFInfo
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- CN106849170A CN106849170A CN201710165857.2A CN201710165857A CN106849170A CN 106849170 A CN106849170 A CN 106849170A CN 201710165857 A CN201710165857 A CN 201710165857A CN 106849170 A CN106849170 A CN 106849170A
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- H02J3/386—
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The embodiment of the invention discloses a kind of method that flexible direct current power transmission system containing wind-powered electricity generation is turned grid-connect mode by isolated island, for solving transverter overcurrent protection tripping operation technical problem of the ac transmission passage by soft lineal system in being disconnected to normal processes caused by island mode is switched to grid-connect mode.
Description
Technical field
The present invention relates to technical field of high voltage power transmission, more particularly to a kind of flexible direct current power transmission system containing wind-powered electricity generation is by orphan
The method that island turns grid-connect mode.
Background technology
As Power Electronic Technique progress, cost decline and reliability raising, Technology of HVDC based Voltage Source Converter is gradually applied to
The wind energy transmission of Large Scale Wind Farm Integration.During steady-state operation, soft lineal system can convey wind energy, and suppress wind power plant voltage pulsation；Exchange
System be short-circuited failure when, soft lineal system can isolate the fault traversing of AC network, improve the reliability of wind-power electricity generation.In wind
Power is generated electricity in the quick evolution developed with the subsequent follow-up of soft straight engineering construction, and the wind energy transmission channel of part wind power plant is formed
The parallel transmission of electricity general layout of soft lineal system and AC system, as shown in figure 1, the wind-powered electricity generation transmission means of this AC/DC parallel is improved
The capacity and reliability of wind energy transmission channel, but also bring the pattern switching problem of AC/DC parallel operation.China is built
Into Nan'ao three-terminal flexible direct-current power transmission system and the end flexible direct current power transmission system of Zhoushan five there is above-mentioned power transmission mode.Work as friendship
When stream passway for transmitting electricity is normal, flexiblesystem runs on grid-connect mode (PQ power limitation controls)；When ac transmission channel failure disconnects
When, soft lineal system runs on island mode (VF perseverances power supply)；Ac transmission passage by normally to disconnect transient process in,
Soft lineal system needs to realize grid-connect mode to the switching of island mode；Ac transmission passage is by being disconnected to normal transient process
In, soft lineal system needs to realize island mode to the switching of grid-connect mode.Can there is a transient state in the switching between both of which
Transient process, will influence the stable operation of soft lineal system and wind power plant when serious.The wind energy of soft lineal system and AC system is parallel
Under power transmission mode, before communication channel failture evacuation, wind energy be only capable of by soft straight system transfers, after communication channel failture evacuation, be
System reliability is improved, communication channel needs to recover AC/DC parallel operation by closing device.Due to combined floodgate breaker both sides
Voltage is respectively the voltage of exchange bulk power system voltage and soft lineal system, there is difference on the frequency, phase difference and amplitude between the two
Difference, longer period of time can produce larger grid-connected dash current after close a floodgate moment and combined floodgate, and flexibility is directly resulted in when serious
DC transmission system sending end transverter is out of service.To solve problem above, technical scheme main at present is as follows：
Technical scheme 1：Configuration high accuracy asynchronous switch-on device or the solid-state switch based on pipe between semiconductor die.Fill above
Put and be installed at breaker closing, both sides voltage at automatic detection combined floodgate, when judgement communication channel recovers normal and switch ends
When voltage difference is close to zero, solid-state switch or breaker closing make soft lineal system and wind power system soft grid-connected, reduce grid-connected combined floodgate
When transient current impact, extend the time that soft lineal system reaches excessively stream setting value.While method of operation discriminating gear or other classes
Like device informs soft direct line by comprehensive each current method of operation of substation breakers State determined system using communication system
System carries out operational mode switching, so as to realize that soft lineal system switchs to safely grid-connect mode by island mode.In above-mentioned handoff procedure
In, if the frequency departure of both sides voltage is smaller at combined floodgate, phase angular displacement is larger, and system needs longer time to wait ability
Realize closing a floodgate；Secondly, communication channel there may be multiple combined floodgate points, if each point that closes a floodgate all install high accuracy asynchronous switch-on device or
Person's solid-state switch, then whole system involve great expense；Meanwhile, system needs method of operation discriminating gear and communication device connection soft straight
Each transformer station on transverter and communication channel, after communication channel recovers normal, assists soft lineal system to determine suitable operation mould
Formula go forward side by side row mode switching.
Technical scheme 2：The amplitude of soft straight inverter output voltage and the amplitude and phase of Phase Tracking ac grid voltage.
There is document to propose that phase difference and voltage difference by the use of points of common connection switch ends, as input quantity, are calculated through pi regulator
The frequency modulation frequency modulation and secondary pressure regulation instruction of soft straight transverter droop control or the control of virtual synchronous machine, but during using the method, it is public
The voltage and phase information at tie point two ends need to pass to soft straight transverter by communication altogether.The time variation of alternating voltage phase angle
Larger, the synchronous adjustment performance of system could be severely affected during using low-speed communication.In view of the unsuitable Bian low speed of phase angular amount
Communications, and the relative change of frequency quantity is little, part document proposes that Bian is adjusted with frequency and carries out phase angle synchronous adjustment indirectly.Phase
Regulation more direct than phase angle, the synchronous adjustment of phase angle is carried out using frequency, and the regulating time cycle is long, is difficult to realize the synchronization of phase angle.
Prior art 1 in handoff procedure, if at combined floodgate the frequency difference of both sides voltage it is small and when differing greatly, system is closed a floodgate
Stand-by period is long；Secondly, communication channel is respectively closed a floodgate and is a little both needed to install high accuracy asynchronous switch-on device or solid-state switch, and cost is held high
It is expensive；Meanwhile, system needs communication device to connect each transformer station on transverter and communication channel, assists soft lineal system to determine suitable
Operational mode is simultaneously switched over.Prior art 2 need it is each to communication channel close a floodgate point both sides voltage and current carry out height
Precision measure, and need that sample information is passed into soft straight transverter by high-speed communication passage, involving great expense, improvement and installation is not
Just.
The content of the invention
A kind of method that flexible direct current power transmission system containing wind-powered electricity generation is turned grid-connect mode by isolated island is the embodiment of the invention provides, is solved
Ac transmission passage determined by soft lineal system changing caused by island mode is switched to grid-connect mode in being disconnected to normal processes
The technical problem of stream device overcurrent protection tripping operation.
The method that a kind of flexible direct current power transmission system containing wind-powered electricity generation provided in an embodiment of the present invention is turned grid-connect mode by isolated island, bag
Include：
S1：Wind power plant transmits wind energy, and ac transmission system by flexible direct current power transmission system and AC transmission system simultaneously
When system breaker disconnects, the flexible direct current power transmission system is in island mode, the transmission system of AC/DC parallel containing wind-powered electricity generation upper strata
Control to send communication channel breaker closing command signal to flexible direct current power transmission system sending end transverter；
S2：After the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by predetermined institute
After stating AC transmission system breaker typical case's feed motion time, bridge in the flexible direct current power transmission system sending end current conversion station is judged
Whether arm current value or tietransformer current value are more than predetermined current value, if so, then the flexible direct current power transmission system is sent
End converter blocking, the flexible direct current power transmission system sending end converter blocking duration is more than predetermined wind power system inertia
After time, the flexible direct current power transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connect mode, if
No, continuation judges whether bridge arm current value or tietransformer current value are big in the flexible direct current power transmission system sending end current conversion station
In predetermined current value.
Preferably, the step S2 is specifically included：
After the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by the predetermined friendship
After stream transmission system breaker typical case's feed motion time, bridge arm electricity in the flexible direct current power transmission system sending end current conversion station is obtained
Flow valuve or tietransformer current value, judge that bridge arm current value or connection become in the flexible direct current power transmission system sending end current conversion station
Whether depressor current value is more than predetermined current value, if so, the then flexible direct current power transmission system sending end converter blocking, described
The flexible direct current power transmission system sending end converter blocking duration is described flexible straight more than after predetermined wind power system inertia time
Stream transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connect mode, if it is not, continuation judges described soft
Property DC transmission system sending end current conversion station in bridge arm current value or tietransformer current value whether be more than predetermined current value.
Preferably, the step S2 is specifically included：
After the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by the predetermined friendship
After stream transmission system breaker typical case's feed motion time, bridge arm electricity in the flexible direct current power transmission system sending end current conversion station is obtained
Flow valuve or tietransformer current value, judge that bridge arm current value or connection become in the flexible direct current power transmission system sending end current conversion station
Whether depressor current value is more than predetermined current value, if so, the then flexible direct current power transmission system sending end converter blocking, passes through
The inertia time that the wind power plant generates electricity obtains predetermined wind power system inertia time, and the flexible direct current power transmission system sending end is changed
After the stream device locking duration is more than predetermined wind power system inertia time, the flexible direct current power transmission system sending end transverter solution
Lock, the flexible direct current power transmission system switchs to grid-connect mode, if it is not, continuation judges the flexible direct current power transmission system sending end change of current
Whether bridge arm current value or tietransformer current value are more than predetermined current value in standing.
A kind of flexible direct current power transmission system containing wind-powered electricity generation provided in the embodiment of the present invention is turned the device of grid-connect mode by isolated island,
Including：
Transmitting element, wind energy is transmitted for wind power plant by flexible direct current power transmission system and AC transmission system simultaneously, and
When AC transmission system breaker disconnects, the flexible direct current power transmission system is in island mode, and the transmitting element is to flexibility
DC transmission system sending end transverter sends communication channel breaker closing command signal；
Switch unit, after receiving the combined floodgate command signal for the flexible direct current power transmission system sending end transverter, warp
After spending predetermined AC transmission system breaker typical case's feed motion time, the flexible direct current power transmission system sending end is judged
Whether bridge arm current value or tietransformer current value are more than predetermined current value in current conversion station, if so, the then flexible direct current
Transmission system sending end converter blocking, the flexible direct current power transmission system sending end converter blocking duration is more than predetermined wind
After electric system inertia time, the flexible direct current power transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to
Grid-connect mode, if it is not, continuation judges bridge arm current value or tietransformer in the flexible direct current power transmission system sending end current conversion station
Whether current value is more than predetermined current value.
Preferably, the switch unit is specifically included：
Measurement subelement, the combined floodgate command signal is received specifically for the flexible direct current power transmission system sending end transverter
Afterwards, by after predetermined AC transmission system breaker typical case's feed motion time, obtaining the flexible DC power transmission system
Bridge arm current value or tietransformer current value in system sending end current conversion station；
Judgment sub-unit, specifically for judging bridge arm current value or connection in the flexible direct current power transmission system sending end current conversion station
Whether transformer current value is connect more than predetermined current value；
Locking subelement, if specifically for bridge arm current value or connection in the flexible direct current power transmission system sending end current conversion station
Transformer current value is more than predetermined current value, then the flexible direct current power transmission system sending end converter blocking；
Subelement is obtained, the inertia time specifically for being generated electricity by the wind power plant obtains predetermined wind power system inertia
Time；
Unblock subelement, specifically for the flexible direct current power transmission system sending end converter blocking duration more than predetermined
Wind power system inertia time after, the flexible direct current power transmission system sending end converter deblocking；
Switching subelement, grid-connect mode is switched to specifically for the flexible direct current power transmission system；
Circulation subelement, if specifically for bridge arm current value or connection in the flexible direct current power transmission system sending end current conversion station
Transformer current value is not more than predetermined current value, then bridge arm in flexible direct current power transmission system sending end current conversion station described in cycle criterion
Whether current value or tietransformer current value are more than predetermined current value.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The method that a kind of flexible direct current power transmission system containing wind-powered electricity generation provided in the embodiment of the present invention is turned grid-connect mode by isolated island
Including：S1：Wind power plant transmits wind energy by flexible direct current power transmission system and AC transmission system simultaneously, and AC transmission system is disconnected
When road device disconnects, the flexible direct current power transmission system is in island mode, the transmission system top level control of AC/DC parallel containing wind-powered electricity generation
Communication channel breaker closing command signal is sent to flexible direct current power transmission system sending end transverter；S2：The flexible direct current is defeated
After electric system sending end transverter receives the combined floodgate command signal, closed by predetermined AC transmission system breaker typical case
After lock actuation time, bridge arm current value or tietransformer current value in the flexible direct current power transmission system sending end current conversion station are judged
Whether predetermined current value is more than, if so, the then flexible direct current power transmission system sending end converter blocking, the flexible direct current is defeated
After the electric system sending end converter blocking duration is more than predetermined wind power system inertia time, the flexible direct current power transmission system
Sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connect mode, if it is not, continuation judges the flexible DC power transmission
Whether bridge arm current value or tietransformer current value are more than predetermined current value in system sending end current conversion station.In the present embodiment,
The pattern switching that soft direct line is united when realizing communication channel recovery by wind-power electricity generation inertial properties and the local current signal of current conversion station
And stable operation, reduction asynchronous switch-on requirement, reduce the stand-by period of closing a floodgate, using local current signal, determine breaker closing
State, without extra high precision measuring device, it is only necessary to or low-speed communication device is installed without transformer station, you can realize soft straight operation
Pattern switching, soft lineal system is switched to grid-connect mode by island mode in solving ac transmission passage by being disconnected to normal processes
The technical problem of caused transverter overcurrent protection tripping operation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with according to these accompanying drawings.
A kind of flexible direct current power transmission system containing wind-powered electricity generation provided in Fig. 1 embodiment of the present invention is turned the side of grid-connect mode by isolated island
The schematic flow sheet of one embodiment of method；
A kind of flexible direct current power transmission system containing wind-powered electricity generation provided in Fig. 2 embodiment of the present invention is turned the side of grid-connect mode by isolated island
The schematic flow sheet of another embodiment of method；
A kind of flexible direct current power transmission system containing wind-powered electricity generation provided in Fig. 3 embodiment of the present invention is turned the dress of grid-connect mode by isolated island
The structural representation of the one embodiment put；
A kind of flexible direct current power transmission system containing wind-powered electricity generation provided in Fig. 4 embodiment of the present invention is turned the dress of grid-connect mode by isolated island
The structural representation of another embodiment put；
A kind of soft lineal system and the parallel wind energy power transmission mode of AC system provided in Fig. 5 embodiment of the present invention are illustrated
Figure；
It is soft straight in communication channel recovery process under a kind of AC/DC parallel method of operation provided in Fig. 6 embodiment of the present invention
The schematic flow sheet of sending end transverter pattern switching strategy.
Specific embodiment
A kind of method that flexible direct current power transmission system containing wind-powered electricity generation is turned grid-connect mode by isolated island is the embodiment of the invention provides, is used
United caused by island mode is switched to grid-connect mode by soft direct line in being disconnected to normal processes in ac transmission passage is solved
The technical problem of transverter overcurrent protection tripping operation.
To enable that goal of the invention of the invention, feature, advantage are more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described, it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
Fig. 1 is referred to, one kind flexible direct current power transmission system containing wind-powered electricity generation provided in the embodiment of the present invention turns grid-connected by isolated island
One embodiment of the method for pattern includes：
101st, wind power plant transmits wind energy, and ac transmission system by flexible direct current power transmission system and AC transmission system simultaneously
When system breaker disconnects, the flexible direct current power transmission system is in island mode, the transmission system of AC/DC parallel containing wind-powered electricity generation upper strata
Control to send communication channel breaker closing command signal to flexible direct current power transmission system sending end transverter；
It is the wind power plant, soft when wind power plant transmits wind-powered electricity generation by flexible direct current power transmission system and AC transmission system simultaneously
Property DC transmission system, AC transmission system constitute the transmission system of AC/DC parallel containing wind-powered electricity generation, the AC/DC parallel containing wind-powered electricity generation
Transmission system also includes flexible direct current power transmission system sending end transverter, flexible direct current power transmission system receiving end transverter, ac transmission
System circuit breaker, the transmission system top level control of AC/DC parallel containing wind-powered electricity generation, it is described when the AC transmission system breaker disconnects
Flexible direct current power transmission system is in island mode, and the transmission system top level control of AC/DC parallel containing wind-powered electricity generation is to described flexible straight
Stream transmission system sending end transverter sends combined floodgate command signal.
102nd, after the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by predetermined institute
After stating AC transmission system breaker typical case's feed motion time, bridge in the flexible direct current power transmission system sending end current conversion station is judged
Whether arm current value or tietransformer current value are more than predetermined current value, if so, then the flexible direct current power transmission system is sent
End converter blocking, the flexible direct current power transmission system sending end converter blocking duration is more than predetermined wind power system inertia
After time, the flexible direct current power transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connect mode, if
No, continuation judges whether bridge arm current value or tietransformer current value are big in the flexible direct current power transmission system sending end current conversion station
In predetermined current value.
As shown in fig. 6, after the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by handing over
Stream transmission system breaker typical case's feed motion time, detect that the flexible direct current power transmission system sending end transverter is defeated with exchanged
The electric current of electric system junction, if detection current value is more than setting value, flexible direct current power transmission system sending end converter blocking；Institute
Unlocked after stating one section of inertia time of flexible direct current power transmission system sending end converter blocking, the flexible direct current power transmission system sending end is changed
Stream device is connected with the AC transmission system, and flexible direct current power transmission system switchs to grid-connect mode, and the inertia time is by the wind
The inertia time of electric field electricity-generating link determines that the inertia time can also be by wind power plant to the grid entry point voltage step response time
It is determined that, if detection current value is not more than setting value, wait breaker typical case's closing time.
The above is to carry out detailed retouching by the method that isolated island turns grid-connect mode to a kind of flexible direct current power transmission system containing wind-powered electricity generation
State, the process for turning the method for grid-connect mode by isolated island to a kind of flexible direct current power transmission system containing wind-powered electricity generation is carried out into detailed retouching below
State, refer to Fig. 2, a kind of flexible direct current power transmission system containing wind-powered electricity generation provided in the embodiment of the present invention turns grid-connect mode by isolated island
Another embodiment of method includes：
201st, wind power plant transmits wind energy, and ac transmission system by flexible direct current power transmission system and AC transmission system simultaneously
When system breaker disconnects, the flexible direct current power transmission system is in island mode, the transmission system of AC/DC parallel containing wind-powered electricity generation upper strata
Control to send communication channel breaker closing command signal to flexible direct current power transmission system sending end transverter；
In AC/DC parallel transmission system, communication channel causes circuit breaker trip to disconnect for some reason, transmission system
In island mode, soft straight transverter runs on permanent power supply pattern (VF patterns).Communication channel restores electricity, asynchronous switch-on
The top level controls such as device, method of operation discriminating gear or soft straight current conversion station system-level controller simultaneously to communication channel breaker and
Soft lineal system sending end change of current station control sends combined floodgate command signal.
202nd, after the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by predetermined institute
After stating AC transmission system breaker typical case's feed motion time, bridge in the flexible direct current power transmission system sending end current conversion station is obtained
Arm current value or tietransformer current value, judge bridge arm current value or connection in the flexible direct current power transmission system sending end current conversion station
Connect whether transformer current value is more than predetermined current value, if so, the then flexible direct current power transmission system sending end converter blocking,
The inertia time generated electricity by the wind power plant obtains predetermined wind power system inertia time, and the flexible direct current power transmission system is sent
After the end converter blocking duration is more than predetermined wind power system inertia time, the flexible direct current power transmission system sending end change of current
Device is unlocked, and the flexible direct current power transmission system switchs to grid-connect mode, if it is not, continuation judges the flexible direct current power transmission system sending end
Whether bridge arm current value or tietransformer current value are more than predetermined current value in current conversion station.
Such as Fig. 6, after sending end transverter receives combined floodgate order, according to the disconnected of the local current signal of current conversion station and top level control
Road device closes a floodgate to order and determines the true closing moment of breaker, waits breaker typical case's feed motion time, such as 50ms.The sending end change of current
Device detects this current conversion station bridge arm current or tietransformer electric current, if electric current be more than a certain setting value, locking sending end transverter,
Suppressed using converter blocking action transverter isolated island turn it is grid-connected during overcurrent, other send receiving end transverter normal
Operation.After sending end converter blocking, according to blower fan system to the generating such as grid entry point voltage step response time link inertial time
Between determine the suitable locking duration, locking continues after a certain section of inertia time that (such as blower fan system is to grid entry point voltage steps
Jump response time etc.), unlock sending end transverter again, and by control mode switch constant power mode (PQ patterns).If electric current is not
More than a certain setting value, then breaker typical case's feed motion time, such as 50ms are waited.
A kind of flexible direct current power transmission system containing wind-powered electricity generation provided in the present embodiment is one by the method that isolated island turns grid-connect mode
Plant and turn grid-connect mode switchover policy suitable for the flexible direct current system isolated island containing wind-powered electricity generation, wind-power electricity generation passes through flexible DC power transmission system
, by electric energy feed-in bulk power grid, whole system constitutes the AC-DC hybrid transmission system containing wind-power electricity generation, such as system and parallel AC system
Shown in Fig. 5.The method of the present embodiment is applied to the sending end transverter of the flexible direct current power transmission system under above-mentioned power transmission mode, is containing
In the AC/DC parallel transmission system of wind-power electricity generation, after communication channel failture evacuation, the breaker disconnected on passage needs to close
Lock runs.Due to asynchronous switch-on device action error, breaker closing random error, the communication of operational mode discriminating gear and calculating
The reason such as time-consuming, soft lineal system transverter cannot quickly determine the closing moment of breaker, and island mode turns grid-connect mode process
In it is soft it is straight change converter bridge arm overcurrent protection action, tripping operation, soft straight converter Control pattern switching failure, the present embodiment mainly leads to
Cross wind-power electricity generation inertial properties and when the local current signal of current conversion station realizes that communication channel recovers the pattern switching of soft lineal system and
Stable operation, reduction asynchronous switch-on requirement, reduces the stand-by period of closing a floodgate；Using local current signal, breaker closing shape is determined
State, without extra high precision measuring device；Only need or low-speed communication device is installed without transformer station, you can realize soft straight operation mould
Formula switches, and the present embodiment is mainly for the soft straight channel containing wind-power electricity generation and the parallel power transmission mode of communication channel, it is also possible to promote
To containing other inertia generating links it is soft directly with exchange parallel transmission system.
Fig. 3 is referred to, one kind flexible direct current power transmission system containing wind-powered electricity generation provided in the embodiment of the present invention turns grid-connected by isolated island
One embodiment of the device of pattern includes：
Transmitting element 301, wind energy is transmitted for wind power plant by flexible direct current power transmission system and AC transmission system simultaneously,
And during the disconnection of AC transmission system breaker, the flexible direct current power transmission system is in island mode, and the transmitting element is to soft
Property DC transmission system sending end transverter send communication channel breaker closing command signal；
Switch unit 302, after receiving the combined floodgate command signal for the flexible direct current power transmission system sending end transverter,
By after predetermined AC transmission system breaker typical case's feed motion time, judging that the flexible direct current power transmission system is sent
Whether bridge arm current value or tietransformer current value are more than predetermined current value in the current conversion station of end, if so, then described flexible straight
Stream transmission system sending end converter blocking, the flexible direct current power transmission system switchs to grid-connect mode, if it is not, continuation judges described soft
Property DC transmission system sending end current conversion station in bridge arm current value or tietransformer current value whether be more than predetermined current value.
The above is that a kind of each unit of the device for turning grid-connect mode by isolated island to flexible direct current power transmission system containing wind-powered electricity generation is carried out
Detailed description, will be turned each additional list of the device of grid-connect mode to a kind of flexible direct current power transmission system containing wind-powered electricity generation by isolated island below
Unit is described in detail, and refers to Fig. 4, and one kind flexible direct current power transmission system containing wind-powered electricity generation provided in an embodiment of the present invention is by isolated island
Another embodiment for turning the device of grid-connect mode includes：
Transmitting element 401, wind energy is transmitted for wind power plant by flexible direct current power transmission system and AC transmission system simultaneously,
And during the disconnection of AC transmission system breaker, the flexible direct current power transmission system is in island mode, and the transmitting element is to soft
Property DC transmission system sending end transverter send communication channel breaker closing command signal；
Switch unit 402, after receiving the combined floodgate command signal for the flexible direct current power transmission system sending end transverter,
By after predetermined AC transmission system breaker typical case's feed motion time, judging that the flexible direct current power transmission system is sent
Whether bridge arm current value or tietransformer current value are more than predetermined current value in the current conversion station of end, if so, then described flexible straight
Stream transmission system sending end converter blocking, the flexible direct current power transmission system switchs to grid-connect mode, if it is not, continuation judges described soft
Property DC transmission system sending end current conversion station in bridge arm current value or tietransformer current value whether be more than predetermined current value.
The switch unit 402 is specifically included：
Measurement subelement 4021, the order of closing a floodgate is received specifically for the flexible direct current power transmission system sending end transverter
After signal, by after predetermined AC transmission system breaker typical case's feed motion time, obtaining the flexible direct current defeated
Bridge arm current value or tietransformer current value in electric system sending end current conversion station；
Judgment sub-unit 4022, specifically for judging bridge arm current value in the flexible direct current power transmission system sending end current conversion station
Or whether tietransformer current value is more than predetermined current value；
Locking subelement 4023, if specifically for bridge arm current value in the flexible direct current power transmission system sending end current conversion station or
Tietransformer current value is more than predetermined current value, then the flexible direct current power transmission system sending end converter blocking；
Subelement 4024 is obtained, the inertia time specifically for being generated electricity by the wind power plant obtains predetermined wind power system
Inertia time；
Unblock subelement 4025, is more than specifically for the flexible direct current power transmission system sending end converter blocking duration
After predetermined wind power system inertia time, the flexible direct current power transmission system sending end converter deblocking；
Switching subelement 4026, grid-connect mode is switched to specifically for the flexible direct current power transmission system；
Circulation subelement 4027, if specifically for bridge arm current value in the flexible direct current power transmission system sending end current conversion station or
Tietransformer current value is not more than predetermined current value, then in flexible direct current power transmission system sending end current conversion station described in cycle criterion
Whether bridge arm current value or tietransformer current value are more than predetermined current value.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Divide, only a kind of division of logic function there can be other dividing mode when actually realizing, for example multiple units or component
Can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.It is another, it is shown or
The coupling each other for discussing or direct-coupling or communication connection can be the indirect couplings of device or unit by some interfaces
Close or communicate to connect, can be electrical, mechanical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list
Unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is to realize in the form of SFU software functional unit and as independent production marketing or use
When, can store in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part for being contributed to prior art in other words or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are used to so that a computer
Equipment (can be personal computer, server, or network equipment etc.) performs the complete of each embodiment methods described of the invention
Portion or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, RandomAccess Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to preceding
Embodiment is stated to be described in detail the present invention, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And these
Modification is replaced, and does not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (5)
1. a kind of method that flexible direct current power transmission system containing wind-powered electricity generation is turned grid-connect mode by isolated island, it is characterised in that including：
S1：When wind power plant transmits wind energy by flexible direct current power transmission system and AC transmission system simultaneously, and AC transmission system
When breaker disconnects, the flexible direct current power transmission system is in island mode, the control of the transmission system of AC/DC parallel containing wind-powered electricity generation upper strata
Make and send communication channel breaker closing command signal to flexible direct current power transmission system sending end transverter；
S2：After the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal, by the predetermined friendship
After stream transmission system breaker typical case's feed motion time, bridge arm electricity in the flexible direct current power transmission system sending end current conversion station is judged
Whether flow valuve or tietransformer current value are more than predetermined current value, if so, then the flexible direct current power transmission system sending end is changed
Stream device locking, the flexible direct current power transmission system sending end converter blocking duration is more than predetermined wind power system inertia time
Afterwards, the flexible direct current power transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connect mode, if it is not,
Then continue to judge whether bridge arm current value or tietransformer current value are big in the flexible direct current power transmission system sending end current conversion station
In predetermined current value.
2. the method that flexible direct current power transmission system containing wind-powered electricity generation according to claim 1 is turned grid-connect mode by isolated island, its feature
It is that the step S2 is specifically included：
It is defeated by the predetermined exchange after the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal
After electric system breaker typical case's feed motion time, bridge arm current value in the flexible direct current power transmission system sending end current conversion station is obtained
Or tietransformer current value, judge bridge arm current value or connection transformation in the flexible direct current power transmission system sending end converter station
Whether device current value is more than predetermined current value, if so, the then flexible direct current power transmission system sending end converter blocking, described soft
Property the DC transmission system sending end converter blocking duration more than after predetermined wind power system inertia time, the flexible direct current
Transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connect mode, if it is not, then continuing to judge described soft
Property DC transmission system sending end current conversion station in bridge arm current value or tietransformer current value whether be more than predetermined current value.
3. the method that flexible direct current power transmission system containing wind-powered electricity generation according to claim 2 is turned grid-connect mode by isolated island, its feature
It is that the step S2 is specifically included：
It is defeated by the predetermined exchange after the flexible direct current power transmission system sending end transverter receives the combined floodgate command signal
After electric system breaker typical case's feed motion time, bridge arm current value in the flexible direct current power transmission system sending end current conversion station is obtained
Or tietransformer current value, judge bridge arm current or tietransformer electricity in the flexible direct current power transmission system sending end current conversion station
Whether flow valuve is more than predetermined current value, if so, the then flexible direct current power transmission system sending end converter blocking, by the wind
The inertia time of electric field electricity-generating obtains predetermined wind power system inertia time, and the flexible direct current power transmission system sending end transverter is closed
After the lock duration is more than predetermined wind power system inertia time, the flexible direct current power transmission system sending end converter deblocking, institute
State flexible direct current power transmission system and switch to grid-connect mode, if it is not, continuation is judged in the flexible direct current power transmission system sending end current conversion station
Whether bridge arm current value or tietransformer current value are more than predetermined current value.
4. a kind of flexible direct current power transmission system containing wind-powered electricity generation is turned the device of grid-connect mode by isolated island, it is characterised in that including：
Transmitting element, sends wind-powered electricity generation and exchanges defeated by flexible direct current power transmission system and AC transmission system simultaneously for wind power plant
When electric system breaker disconnects, the flexible direct current power transmission system is in island mode, and the transmitting element is defeated to flexible direct current
Electric system sending end transverter sends communication channel breaker closing command signal；
Switch unit, after receiving the combined floodgate command signal for the flexible direct current power transmission system sending end transverter, by pre-
After fixed AC transmission system breaker typical case's feed motion time, the flexible direct current power transmission system sending end change of current is judged
Whether bridge arm current value or tietransformer current value are more than predetermined current value in standing, if so, the then flexible DC power transmission
System sending end converter blocking, the flexible direct current power transmission system sending end converter blocking duration is more than predetermined wind-powered electricity generation system
After system inertia time, the flexible direct current power transmission system sending end converter deblocking, the flexible direct current power transmission system switchs to grid-connected
Pattern, if it is not, continuation judges bridge arm current value or tietransformer electric current in the flexible direct current power transmission system sending end current conversion station
Whether value is more than predetermined current value.
5. flexible direct current power transmission system containing wind-powered electricity generation according to claim 4 is turned the device of grid-connect mode by isolated island, its feature
It is that the switch unit is specifically included：
Measurement subelement, after receiving the combined floodgate command signal specifically for the flexible direct current power transmission system sending end transverter,
By after predetermined AC transmission system breaker typical case's feed motion time, obtaining the flexible direct current power transmission system and sending
Bridge arm current value or tietransformer current value in the current conversion station of end；
Judgment sub-unit, specifically for judging that bridge arm current value or connection become in the flexible direct current power transmission system sending end current conversion station
Whether depressor current value is more than predetermined current value；
Locking subelement, if specifically for bridge arm current value in the flexible direct current power transmission system sending end current conversion station or connection transformation
Device current value is more than predetermined current value, then the flexible direct current power transmission system sending end converter blocking；
Subelement is obtained, the inertia time specifically for being generated electricity by the wind power plant obtains predetermined wind power system inertial time
Between；
Unblock subelement, predetermined wind is more than specifically for the flexible direct current power transmission system sending end converter blocking duration
After electric system inertia time, the flexible direct current power transmission system sending end converter deblocking；
Switching subelement, grid-connect mode is switched to specifically for the flexible direct current power transmission system；
Circulation subelement, if specifically for bridge arm current value in the flexible direct current power transmission system sending end current conversion station or connection transformation
Device current value is not more than predetermined current value, then bridge arm current in flexible direct current power transmission system sending end current conversion station described in cycle criterion
Whether value or tietransformer current value are more than predetermined current value.
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| EP4184779A1 (en) * | 2019-04-25 | 2023-05-24 | Mitsubishi Electric Corporation | Control device and power conversion device |
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