CN106159987B - A kind of method of DC grid topology and the fast quick-recovery of fault isolation system - Google Patents
A kind of method of DC grid topology and the fast quick-recovery of fault isolation system Download PDFInfo
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- CN106159987B CN106159987B CN201610514949.2A CN201610514949A CN106159987B CN 106159987 B CN106159987 B CN 106159987B CN 201610514949 A CN201610514949 A CN 201610514949A CN 106159987 B CN106159987 B CN 106159987B
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- grid
- current
- inverter
- fault
- circuit breaker
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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
-
- 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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
-
- 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]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a kind of DC grid topologys, include AC network, DC grid and the AC/DC inverter for connecting AC network and DC grid in the topology, the series direct current breaker between DC grid and AC/DC inverter, other positions in DC grid configure the switchgear without DC Line Fault breaking capacity, the invention also discloses the methods of the fast quick-recovery of fault isolation system under the topology, the topology and method cooperation, the function of DC grid fast recovery of power supply can be achieved, and there is advantage at low cost.
Description
Technical field
The present invention relates to a kind of DC grid topology and the methods of the fast quick-recovery of fault isolation system, belong in electric system
DC grid field.
Background technique
With the progress of power electronic technique, the improvement of the equipment such as inverter, multiterminal element power grid is applied in order to existing
It is real, but since conventional breaker can not cut-off direct fault current, the prior art is needed once there is DC Line Fault
Stop entire DC grid power supply, waits fault current to disappear, then by AC system switch trip come isolated fault, system is extensive
The multiple time is second grade.
Although having there is producer to have developed the dc circuit breaker for having disjunction direct fault current ability, if all open
It closes equipment and all selects dc circuit breaker, although being able to achieve continuous electroblation failure, its price is very expensive.There is provided herein
A kind of DC grid topology and Fault Isolation and system recovery method using lesser amt dc circuit breaker, makes compared to existing
With the technology of AC circuit breaker disjunction fault current, system recovery time can be accelerated into a few tens of milliseconds by second grade；Compared to existing
There is dc circuit breaker configuration, cost can be substantially reduced, there is wide future in engineering applications.
Summary of the invention
It is an object of the invention to propose a kind of DC grid topology, can take into account reduce cost and DC Line Fault isolation and
The requirement of the fast quick-recovery of system, is suitable for engineer application.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of DC grid is topological, only the series direct current breaker between DC grid and AC/DC inverter, in direct current
Remaining in net needs the position of disjunction to configure the switchgear without direct fault current connecting-disconnecting function, thus reduce cost and
Retain the function of fast quick-recovery when the system failure.
The AC/DC inverter is voltage source converter, and including but not limited to: two level blocks, transformer are multiple
Change structure or modular multilevel structure, quantity are no less than 1.
Preferably, reactor can be increased between dc circuit breaker and AC/DC inverter.
The dc circuit breaker can cut-off direct fault current；
The switchgear of the no direct fault current connecting-disconnecting function includes but is not limited to: alternating-current switch, disconnecting link.
A kind of DC grid Fault Isolation and system recovery method are applied in the above DC grid system, it is preferable that packet
Containing following steps:
Step SS1 judges to break down in DC grid extremely by DC voltage and current, if a failure occurs, into step
Otherwise rapid SS2 returns to step SS1；
Step SS2, which issues order, acts dc circuit breaker, cut-offs AC/DC inverter and DC grid, enters step
SS3；
Step SS3 judges whether fault current is less than Iset, then enters step SS4 in this way；Such as by delay Tset, electric current
Still it is greater than Iset, then termination system is run；
The switch of step SS4 tripping fault zone two sides, subsequently into step SS5；
Step SS5 restarts AC/DC inverter behind isolated fault region, is overlapped dc circuit breaker, restores direct current
Net power supply.
In the Fault Isolation and system recovery method, the current setting value Iset is K times of DC rated current,
Wherein 0≤K≤1, the delay definite value Tset are 3ms≤Tset≤100ms with reference to dc circuit breaker breaking speed.
Advantageous effects of the invention: the present invention can be realized DC network failure isolation and fast quick-recovery function
Can, and cost is relatively low, and it is simple and reliable, it is suitble to engineer application.
Detailed description of the invention
Fig. 1 is a kind of DC grid topology of the invention.
Fig. 2 is the flow chart of a kind of Fault Isolation and system quick recovery method of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Attached drawing 1 show a kind of three ends DC transmission system schematic diagram provided by the invention, including three use half-bridge MMC
AC/DC converter station S1, S2 and S3 of topology, and three-line L1, L2, L3 of connection S1 and S2, S2 and S3 and S1 and S3,
In this embodiment, DC grid be three end ring web frames, including connection S1, S2, S3 between DC bus, DC line,
Switchgear, the switchgear configured in DC grid is 6 pairs of quick disconnecting links for not having direct fault current breaking capacity
Q12, Q13, Q21, Q23, Q31, Q32, between DC grid and S1, S2, S3 arranged in series three to dc circuit breaker DCB1,
DCB2、DCB3。
Attached drawing 2 show a kind of Fault Isolation provided by the invention and system recovery method flow chart, is applied to such as attached drawing 1
DC grid, method includes the following steps:
Step SS1 judges to break down in DC grid extremely by DC voltage and current, if a failure occurs, into step
Otherwise rapid SS2 returns to step SS1；
Step SS2, which issues order, acts dc circuit breaker, cut-offs AC/DC inverter and DC grid, enters step
SS3；
Step SS3 judges whether fault current is less than Iset, then enters step SS4 in this way；Such as by delay Tset, electric current
Still it is greater than Iset, then termination system is run；
The switch of step SS4 tripping fault zone two sides, subsequently into step SS5；
Step SS5 restarts AC/DC inverter behind isolated fault region, is overlapped dc circuit breaker, restores direct current
Net power supply.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of DC grid topology, which is characterized in that the series direct current breaker between DC grid and AC/DC inverter,
Remaining in DC grid needs the position of disjunction to configure the switchgear without direct fault current connecting-disconnecting function；Specifically include
Following steps:
Step SS1, judge to break down in DC grid extremely by DC voltage and current, if a failure occurs, enter step
Otherwise SS2 returns to step SS1；
Step SS2, issuing order acts dc circuit breaker, cut-offs AC/DC inverter and DC grid, enters step SS3；
Step SS3, judge whether fault current is less than current setting value Iset, then enter step SS4 in this way；It is such as fixed by delay
Value Tset, fault current are still greater than current setting value Iset, then termination system is run；
Step SS4, the switchgear without direct fault current breaking capacity of tripping fault zone two sides, subsequently into step
SS5；
Step SS5, behind isolated fault region, AC/DC inverter is restarted, is overlapped dc circuit breaker, restores DC grid
Power supply.
2. a kind of DC grid topology as described in claim 1, it is characterised in that: the AC/DC inverter is voltage-source type
Inverter, the voltage source converter are two level blocks, transformer multiple inverter configuration or modular multilevel structure, electricity
Potential source type inverter quantity is more than or equal to 1.
3. a kind of DC grid topology as described in claim 1, it is characterised in that: changed in the dc circuit breaker and AC/DC
It flows and increases setting reactor between device, to inhibit fault current.
4. a kind of DC grid topology as described in claim 1, it is characterised in that: the dc circuit breaker is to cut-off direct current
Fault current.
5. a kind of DC grid topology as described in claim 1, it is characterised in that: the no direct fault current connecting-disconnecting function
Switchgear include alternating-current switch, disconnecting link.
6. the topologically corresponding DC grid Fault Isolation of DC grid as described in claim 1 and system recovery method, special
Sign is: the current setting value Iset is K times of DC rated current, wherein 0≤K≤1, the delay definite value Tset reference
Dc circuit breaker breaking speed is 1ms≤Tset≤100ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610514949.2A CN106159987B (en) | 2016-06-30 | 2016-06-30 | A kind of method of DC grid topology and the fast quick-recovery of fault isolation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610514949.2A CN106159987B (en) | 2016-06-30 | 2016-06-30 | A kind of method of DC grid topology and the fast quick-recovery of fault isolation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106159987A CN106159987A (en) | 2016-11-23 |
| CN106159987B true CN106159987B (en) | 2018-12-21 |
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| CN201610514949.2A Active CN106159987B (en) | 2016-06-30 | 2016-06-30 | A kind of method of DC grid topology and the fast quick-recovery of fault isolation system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620378A (en) * | 2019-08-23 | 2019-12-27 | 广东电网有限责任公司珠海供电局 | Three-terminal star-shaped interconnected direct-current power distribution network topology system |
| CN110994419B (en) * | 2019-11-08 | 2024-04-12 | 广东电网有限责任公司 | Uninterrupted maintenance system and uninterrupted maintenance method for multiport direct current circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606911A (en) * | 2013-10-12 | 2014-02-26 | 张家港智能电力研究院有限公司 | Method for removing instantaneous short circuit earth faults of direct current line of flexible direct current power transmission system |
| CN104362663A (en) * | 2014-12-05 | 2015-02-18 | Pwm驱动有限公司 | Multi-terminal DC (Direct Current) system-based circuit breaker device |
| CN104753043A (en) * | 2015-03-27 | 2015-07-01 | 山东大学 | Multi-level current converter with direct-current fault ride-through capability and working method |
| CN105071373A (en) * | 2015-08-27 | 2015-11-18 | 中国电力科学研究院 | Configuration system and method of DC switch field in flexible DC power transmission system |
| EP3032677A1 (en) * | 2014-12-12 | 2016-06-15 | General Electric Technology GmbH | DC electrical network |
-
2016
- 2016-06-30 CN CN201610514949.2A patent/CN106159987B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606911A (en) * | 2013-10-12 | 2014-02-26 | 张家港智能电力研究院有限公司 | Method for removing instantaneous short circuit earth faults of direct current line of flexible direct current power transmission system |
| CN104362663A (en) * | 2014-12-05 | 2015-02-18 | Pwm驱动有限公司 | Multi-terminal DC (Direct Current) system-based circuit breaker device |
| EP3032677A1 (en) * | 2014-12-12 | 2016-06-15 | General Electric Technology GmbH | DC electrical network |
| CN104753043A (en) * | 2015-03-27 | 2015-07-01 | 山东大学 | Multi-level current converter with direct-current fault ride-through capability and working method |
| CN105071373A (en) * | 2015-08-27 | 2015-11-18 | 中国电力科学研究院 | Configuration system and method of DC switch field in flexible DC power transmission system |
Non-Patent Citations (2)
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| 基于MMC的多端直流输电系统直流侧故障控制保护策略;仉雪娜等;《电力系统自动化》;20130810;第37卷(第15期);第140-145页 * |
| 多端直流输电与直流电网技术;汤广福等;《中国电机工程学报》;20130405;第33卷(第10期);第8-17，S2页 * |
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| Publication number | Publication date |
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| CN106159987A (en) | 2016-11-23 |
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| CB02 | Change of applicant information |
Inventor after: Qiu Defeng Inventor after: Tian Jie Inventor after: Lu Yu Inventor after: Dong Yunlong Inventor after: Li Gang Inventor after: Jiang Tiangui Inventor after: Liu Dan Inventor after: Yuan Xiaodong Inventor after: Li Qiang Inventor before: Qiu Defeng Inventor before: Tian Jie Inventor before: Lu Yu Inventor before: Dong Yunlong Inventor before: Li Gang Inventor before: Jiang Tiangui |
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Effective date of registration: 20161220 Address after: 211106 Jiangning, Jiangsu, Jiangsu Province, the source of the road No. 69 Applicant after: Nari-Relays Electric Co., Ltd. Applicant after: Nanjing Nari-Relays Engineering Technology Co., Ltd. Applicant after: ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID JIANGSU ELECTRIC POWER COMPANY Address before: 211106 Jiangning, Jiangsu, Jiangsu Province, the source of the road No. 69 Applicant before: Nari-Relays Electric Co., Ltd. Applicant before: Nanjing Nari-Relays Engineering Technology Co., Ltd. |
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