CN109560564A - A kind of method that flexible DC transmission bipolar DC system inhibits inverter overload - Google Patents
A kind of method that flexible DC transmission bipolar DC system inhibits inverter overload Download PDFInfo
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- CN109560564A CN109560564A CN201710886506.0A CN201710886506A CN109560564A CN 109560564 A CN109560564 A CN 109560564A CN 201710886506 A CN201710886506 A CN 201710886506A CN 109560564 A CN109560564 A CN 109560564A
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- inverter
- bipolar
- electronic switch
- pole
- flexible
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 title claims abstract description 30
- 238000005265 energy consumption Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000005404 monopole Effects 0.000 claims description 21
- 230000003111 delayed effect Effects 0.000 claims description 5
- 230000005764 inhibitory process Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 2
- 230000010485 coping Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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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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- H02J3/383—
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention proposes a kind of methods that flexible DC transmission bipolar DC system inhibits inverter overload, for be connected to new energy access etc. isolated islands passive system, bipolar inverter exchange side the two poles of the earth are respectively connected to independent ac bus, the two poles of the earth bus is using electronic switch equipment as bus connection switch, the bipolar operation of inverter, the connection of mother electronic switch, when one pole is latched, monitoring is when bipolar power is greater than a pole inverter maximum power and limits, disconnect mother electronic switch, when bipolar power is limited less than a pole maximum power, electronic switch on state is kept.Furthermore, it breaks down problem for sending end inverter DC line to receiving end inverter, respectively increase the energy consumption resistor device connected by electronic switch on positive and negative anodes DC bus, electronic switch investment energy consumption resistor device is opened when detecting overvoltage of direct current, inhibits inverter overvoltage.
Description
Technical field
The invention belongs to Power System Flexible field of power transmission, and in particular to a kind of inhibition of flexible DC transmission bipolar DC system is changed
Flow the method for device overload.
Background technique
Flexible DC transmission uses voltage source converter, can improve exchange system with separately adjustable active and idle output
The ability to transmit electricity of system, is readily configured multi-terminal direct current transmission system, the electricity generation grid-connecting of renewable energy, isolated island urban electricity supply and
The application fields such as AC system interconnection, have apparent competitiveness.It is flexible with the progress of power electronic devices and control technology
DC transmission system capacity and voltage class are higher and higher.
In order to realize the requirement of high-capacity power conveying, need to increase submodule quantity to improve voltage class, but excessive
Sub-module cascade increases valve control equipment and controls difficulty, therefore uses dipolar configuration form, is reducing single convertor unit submodule
Achieve the purpose that same transimission power while cascade number, becomes a kind of feasible selection.
Flexible DC transmission bipolar DC system structure, when realizing that isolated island renewable new energy is sent out, the new energy such as wind-powered electricity generation, photovoltaic
Multiple spot imports ac bus, bipolar each access ac bus, and such as bipolar bus is not connected with, the two poles of the earth unbalanced power, inverter
There is larger current in earthing pole, in addition, connecting the bus power of the pole for whole damages when one pole of inverter is broken down
It loses, cannot achieve effective submitting of new energy.It if bipolar bus is directly connected to, is not controlled, when a pole is broken down, separately
One pole is since power shifts, and there are overload stoppage in transit risks.In addition, power can not when breaking down outside sending end inverter area
It sends out, corresponding failure pole will appear overvoltage of direct current problem etc..
In order to which effectively reliable one pole of bipolar DC system inverter that solves is broken down locking, another pole overload is avoided to stop
Fortune and sending end inverter external area error, avoid failure pole from overvoltage of direct current occur, guarantee effective submitting problem of new energy,
It needs to find new overload and inhibits overvoltage of direct current method.
Summary of the invention
The object of the present invention is to provide a kind of flexible DC transmission bipolar DC system inhibit inverter overload method,
Monopole failure is coped with, inhibits another pole overload problem occur, and solve the problems, such as DC over-voltage, the realization new energy of optimization
It is reliable to send out.
In order to achieve the above object, solution of the invention is:
A kind of method that flexible DC transmission bipolar DC system inhibits inverter overload, bipolar inverter exchange bipolar point of side
Respective ac bus is not accessed, increases the connection of mother electronic switch equipment between ac bus, and the bipolar operation of inverter is female
Join electronic switch connection, when the locking of one pole of inverter, monitoring judges that bipolar power is limited greater than monopole inverter maximum power
When Pmax processed, mother electronic switch is disconnected, when bipolar power is less than monopole inverter maximum power limitation Pmax, keeps female
Join electronic switch on state.
Further, specific steps are as follows:
(1) inverter is bipolar is respectively connected to respective ac bus, increases mother electronic switch between ac bus and sets
Standby, mother electronic switch is connected state；
(2) the relatively more current bipolar bus power P=P1+P2 of judgement and monopole inverter maximum power limit Pmax size；
When monopole failure locking, judge as P>=Pmax, be delayed t moment, disjunction mother electronic switch QF, as P<Pmax,
Holding mother electronic switch QF is connected state；
(3) after one pole failure locking of inverter, failure extremely corresponds to the power on ac bus according to mother electronic switch
State, sent out by another normal pole or stop sending out, ensure that power is sent out in Pmax in non-faulting pole, so as to avoid
Failure pole causes another pole overload stoppage in transit problem.
Further, step (2) the delay time t can setting range be (0-Tset), TsetAfter being latched less than monopole in addition
One pole power rise is to the inverter overload threshold time.
Further, the mother electronic switch is the fast electric minor switchgear with electric current division function.
Further, the mother electronic switch is electronic power switch or dc circuit breaker.
Further, monopole inverter maximum power limitation Pmax is changing for inverter design capacity or artificial settings
It flows device and runs maximum power section limits value.
Further, it is applied to new energy sending end inverter and inhibits overload.
Further, outside for sending end inverter, DC line to the receiving end inverter problem of breaking down can not be sent out grid-connected
When, increase electronic switch on positive and negative anodes DC bus and connect energy consumption resistor device, inhibits overvoltage of direct current.
Further, the control method that the increase electronic switch connects energy consumption resistor device is specifically, when a pole sending end
When breaking down outside inverter area, there is overvoltage of direct current in failure pole, judges pole DC voltage UdcWith over-voltage setting value
UdcSet works as Udc≥UdcWhen set, be delayed △ t moment, opens the pole electronic switch, puts into energy consumption resistor device, reaches inhibition
Overvoltage of direct current purpose.
Further, the delay time △ t is less than DC overvoltage protection actuation time tov, the over-voltage setting value
UdcSet is less than equipment and bears overvoltage threshold value.
Further, the flexible DC transmission bipolar DC system inhibits the method for inverter overload to be applied to flexible direct current defeated
Electric isolated island bipolar DC system.
Property direct current transportation bipolar DC system inhibit inverter overload method, pass through increase mother electronic switch, monitoring
Bipolar power and monopole maximum power are compared in judgement, when the failure of inverter monopole is latched, control bus connection switch disjunction, reply
Monopole failure effectively inhibits another pole overload problem occur, when for overpressure problems occur, puts into energy consumption resistor device, suppression
Overvoltage processed, the reliable submitting of the realization new energy of optimization.
Detailed description of the invention
Fig. 1 is the schematic diagram that flexible DC transmission bipolar DC system increases electronic switch and energy-consuming device in the present invention；
Fig. 2 is the method schematic diagram that a kind of flexible DC transmission bipolar DC system of the present invention inhibits inverter overload.
Specific embodiment
Below with reference to drawings and the specific embodiments, technical solution of the present invention is described in detail.
Fig. 1 is the schematic diagram that flexible DC transmission bipolar DC system increases electronic switch and energy-consuming device in the present invention, i.e.,
Increase QF mother electronic switch between 1 ac bus of pole and 2 ac bus of pole to be connected, increases QF3 electronic switch in pole 1
Energy consumption resistor device is connected, increases QF4 electronic switch in pole 2 and connects energy consumption resistor device.Fig. 2 is that the present invention is a kind of flexible straight
Stream transmission of electricity bipolar DC system inhibits the method schematic diagram of inverter overload, and specific method includes the following:
(1) ac bus is respectively accessed in inverter bi-polar AC side, mother electronic switch equipment QF between bus of increasing exchanges,
Mother electronic switch QF is connected state；
(2) power P 1 is sent out in monitoring inverter pole 1, and power P 2 is sent out in pole 2, calculates bipolar power P=P1+P2, judges ratio
Relatively current bipolar bus power P and monopole inverter maximum power Pmax size；When monopole breaks down, P >=Pmax is worked as in judgement
When, be delayed t moment disjunction mother electronic switch QF, and as P < Pmax, holding mother electronic switch QF is connected state；
(3) after one pole failure locking of inverter, failure extremely corresponds to the power on ac bus according to mother electronic switch
Switch state, sent out by another normal pole or stop sending out, ensure that power is sent out in Pmax in non-faulting pole, to keep away
Having exempted from failure pole causes another pole overload to be stopped transport, and realizes that maximizing new energy sends out；
(4) after a pole is broken down outside inverter sending end area, it is assumed that break down for pole 1, power can not send out grid-connected, inspection
It surveys failure pole 1 and overpressure situation, 1 DC voltage U of pole occursdcMore than over-voltage setting value UdcSet, delay △ t moment open connection pole
The electronic switch QF3 of 1 energy consumption resistor, is consumed energy by resistance, inhibits overvoltage of direct current problem.
The present invention respectively accesses an ac bus with bipolar inverter exchange side, is connected between bus by mother electronic switch
It connects, inhibiting the method for inverter overload is that embodiment is introduced in embodiment, but the present invention is not limited to bipolar DC systems respectively to connect
Enter an ac bus, it is suitable for exchange sides can connect a plurality of ac bus, it is connected between bus by mother electronic switch,
According to the method, when monopole breaks down, by judging power situation, determine under mother electronic switch disjunction state status
Inhibition inverter overload method.
When coping with monopole failure, bipolar power and monopole maximum power situation are compared in judgement, and mother electronic type is opened in determination
The method for closing operation, to inhibit overload method for new energy sending end transmission system.In addition, for outside sending end inverter area,
When DC line to receiving end inverter failure can not send out grid-connected, respectively by increasing electronic type on positive and negative anodes DC bus
Switch connection energy consumption resistor device, when DC line or receiving end inverter break down, when detecting DC over-voltage, control electronics
Formula switch conduction puts into energy consumption resistor device, solves the problems, such as overvoltage of direct current.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (11)
1. a kind of method that flexible DC transmission bipolar DC system inhibits inverter overload, it is characterised in that: bipolar inverter is handed over
Side is bipolar is respectively connected to respective ac bus for stream, increases the connection of mother electronic switch equipment, inverter between ac bus
Bipolar operation, the connection of mother electronic switch, when the locking of one pole of inverter, monitoring judges that bipolar power is greater than monopole inverter
When maximum power limits Pmax, mother electronic switch is disconnected, when bipolar power is limited less than monopole inverter maximum power
When Pmax, mother electronic switch on state is kept.
2. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as described in claim 1, specific to grasp
Steps are as follows for work:
(1) inverter is bipolar is respectively connected to respective ac bus, increases mother electronic switch equipment between ac bus, female
Connection electronic switch is connected state；
(2) the relatively more current bipolar bus power P=P1+P2 of judgement and monopole inverter maximum power limit Pmax size；Monopole
When failure locking, judge as P>=Pmax, be delayed t moment, disjunction mother electronic switch QF, as P<Pmax, keeps
Mother electronic switch QF is connected state；
(3) after one pole failure locking of inverter, failure extremely corresponds to the power on ac bus according to the shape of mother electronic switch
State is sent out by another normal pole or stops sending out, and ensure that power is sent out in Pmax in non-faulting pole, so as to avoid failure
Pole causes another pole overload stoppage in transit problem.
3. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as claimed in claim 2, feature exists
In: step (2) the delay time t can setting range be (0-Tset), TsetLess than other pole power rise after monopole locking
To the inverter overload threshold time.
4. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as described in claim 1, feature exists
In: the mother electronic switch is the fast electric minor switchgear with electric current division function.
5. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as claimed in claim 4, feature exists
In: the mother electronic switch is electronic power switch or dc circuit breaker.
6. a kind of method of flexible DC transmission bipolar DC system inhibition inverter overload as described in any one of claim 1 to 5,
It is characterized by: the monopole inverter maximum power limitation Pmax is the inverter of inverter design capacity or artificial settings
Run maximum power section limits value.
7. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as described in claim 1, feature exists
In: it is applied to new energy sending end inverter and inhibits overload.
8. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as described in claim 1, feature exists
In: it is directed to outside sending end inverter, it is straight in positive and negative anodes when DC line to the receiving end inverter problem of breaking down can not send out grid-connected
It flows and increases electronic switch connection energy consumption resistor device on bus, inhibit overvoltage of direct current.
9. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as claimed in claim 8, feature exists
In: the control method for increasing electronic switch connection energy consumption resistor device is specifically, when a pole sending end inverter area is outgoing
When existing failure, there is overvoltage of direct current in failure pole, judges pole DC voltage UdcWith over-voltage setting value UdcSet works as Udc≥
UdcWhen set, be delayed △ t moment, opens the pole electronic switch, puts into energy consumption resistor device, reaches and inhibits overvoltage of direct current mesh
's.
10. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as claimed in claim 9, feature exists
In: the delay time △ t is less than DC overvoltage protection actuation time tov, the over-voltage setting value UdcSet is held less than equipment
Voltage threshold value is received.
11. a kind of flexible DC transmission bipolar DC system inhibits the method for inverter overload as described in claim 1, feature exists
In: the flexible DC transmission bipolar DC system inhibits the method for inverter overload to be applied to the bipolar system of flexible DC transmission isolated island
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710886506.0A CN109560564B (en) | 2017-09-27 | 2017-09-27 | Method for restraining converter overload of flexible direct current transmission bipolar system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710886506.0A CN109560564B (en) | 2017-09-27 | 2017-09-27 | Method for restraining converter overload of flexible direct current transmission bipolar system |
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| CN109560564A true CN109560564A (en) | 2019-04-02 |
| CN109560564B CN109560564B (en) | 2022-05-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708361A (en) * | 2021-07-22 | 2021-11-26 | 广东电网有限责任公司阳江供电局 | Parallel direct current system sharing direct current energy consumption device |
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| CN103618305A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Method for allowing multi-end flexible direct-current power transmission system to conduct charged access through isolation switch |
| CN105140948A (en) * | 2015-07-06 | 2015-12-09 | 南京南瑞继保电气有限公司 | Flexible direct current transmission system power coordination control method |
| CN105162155A (en) * | 2015-08-26 | 2015-12-16 | 浙江大学 | Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability |
| CN107039993A (en) * | 2017-04-20 | 2017-08-11 | 国网福建省电力有限公司 | Symmetrical bipolar flexible direct-current transmission converter power turns band control method |
-
2017
- 2017-09-27 CN CN201710886506.0A patent/CN109560564B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618305A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Method for allowing multi-end flexible direct-current power transmission system to conduct charged access through isolation switch |
| CN105140948A (en) * | 2015-07-06 | 2015-12-09 | 南京南瑞继保电气有限公司 | Flexible direct current transmission system power coordination control method |
| CN105162155A (en) * | 2015-08-26 | 2015-12-16 | 浙江大学 | Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability |
| CN107039993A (en) * | 2017-04-20 | 2017-08-11 | 国网福建省电力有限公司 | Symmetrical bipolar flexible direct-current transmission converter power turns band control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708361A (en) * | 2021-07-22 | 2021-11-26 | 广东电网有限责任公司阳江供电局 | Parallel direct current system sharing direct current energy consumption device |
| CN113708361B (en) * | 2021-07-22 | 2024-02-13 | 广东电网有限责任公司阳江供电局 | Parallel direct current system sharing direct current energy consumption device |
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