CN106451519B - A kind of flow control method of flexible direct current power grid - Google Patents
A kind of flow control method of flexible direct current power grid Download PDFInfo
- Publication number
- CN106451519B CN106451519B CN201610921094.5A CN201610921094A CN106451519B CN 106451519 B CN106451519 B CN 106451519B CN 201610921094 A CN201610921094 A CN 201610921094A CN 106451519 B CN106451519 B CN 106451519B
- Authority
- CN
- China
- Prior art keywords
- line
- anode
- symmetrical
- direct current
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005404 monopole Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- 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]
Abstract
The present invention discloses a kind of flow control method of flexible direct current power grid, when, there are when asymmetric operation route, control is in anode, the anode circuit current-symmetrical of the DC line of symmetrical operation state in the DC line for connecting this converter station.Flexible direct current electric network swim control method disclosed by the invention, when occurring monopole disconnection fault in DC grid and causing route asymmetric operation, purposefully remaining route positive and negative electrode Line Flow can be controlled, All other routes are avoided Overload occur, effectively improve the runnability of DC grid, and can guarantee that the earth current that the converter station of disconnection fault does not occur is smaller, it has a good application prospect.
Description
Technical field
The invention belongs to Power System Flexible technical field of direct current power transmission, and in particular to a kind of trend of flexible direct current power grid
Control method.
Background technique
Flexible DC transmission uses voltage source converter, and control active power and idle function can be controlled independently and quickly
Rate inhibits the fluctuation of system frequency and voltage, improves the steady-state performance of grid-connected AC system to improve the stability of system.
With the increasingly increase of the increasingly depleted of fossil energy and improvement environmental pressure, China or even the world are faced with energy resource structure
Strategical adjustment, large-scale development and utilization new energy are imperative.In order to adapt to the profound change of future source of energy pattern, need to add
It is novel fastly to collect submitting and the research and development of consumption technology to improve the utilization efficiency of generation of electricity by new energy.In recent years, scholars examine again
Depending on power grid transmission & distribution power technology, DC techniques become research hotspot again, and the concepts such as flexible direct current power grid are come into being.
Flexible direct current power grid is the flexible HVDC transmission system with " mesh ", has a plurality of AC line between converter station
Road is connected by dc circuit breaker, and whole system is caused to possess redundancy.Due to what is broken down when DC line uses overhead line
Probability is higher, when a DC line breaks down protection disconnection route, in fact it could happen that DC line positive and negative electrode is asymmetric
The case where operation, at this time, it may be necessary to which suitable strategy is taken to avoid the problems such as causing All other routes overload.
Summary of the invention
The object of the present invention is to provide the flow control methods of flexible direct current power grid, by changing converter station positive and negative electrode
The control of device is flowed, realizes and avoids other DC lines from overload occur in DC line broken string, effectively improve flexible direct current electricity
The runnability of net, has a good application prospect.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of flow control method of flexible direct current power grid, is applied on flexible direct current power grid, the flexible direct current power grid
Including converter station and realize a plurality of DC line of each converter station reticular structure interconnection, the DC line include anode,
Anode circuit, the converter station include positive inverter and cathode inverter, it is characterised in that: the anode inverter and cathode
Inverter is connected using the very bipolar mode of connection with corresponding DC line, is existed when in the DC line for connecting this converter station
When asymmetric operation route, anode, the anode circuit current-symmetrical of DC line of the control in symmetrical operation state, including with
Lower two kinds of regulative modes,
(A) by adjust converter station bus voltage, realize control in symmetrical operation state DC line anode,
Anode circuit current-symmetrical；
(B), there are when commutator transformer or DC power flow controller, passing through commutator transformer or direct current on DC line
Flow controller adjusts the electric current of corresponding DC line, realizes the positive, negative of DC line of the control in symmetrical operation state
Polar curve road current-symmetrical.
The flow control method of flexible direct current power grid above-mentioned, it is characterised in that: the DC line symmetrical operation is positive
Pole, anode circuit are in connected state together or are in off-state together, and otherwise, which is asymmetric operation；The company
Logical state is the breaker of DC line two sides or is coincidence every knife, and the off-state is the breaker of DC line two sides
Or there are quartiles every knife.
After adopting the above scheme, the invention has the benefit that
1) DC grid flow control method provided by the invention occurs monopole disconnection fault in DC grid and causes line
When the asymmetric operation of road, purposefully remaining route positive and negative anodes circuit trend can be controlled, All other routes is avoided to occur
Overload effectively improves the runnability of DC grid；
2) DC grid flow control method provided by the invention can guarantee connecing for the converter station that disconnection fault does not occur
Earth-current is smaller.
Detailed description of the invention
Fig. 1 one embodiment of the invention flexible direct current line commutation station and other converter station connection schematic diagrams.
Fig. 2 is the flow chart of one embodiment of the invention flexible direct current electric network swim control method.
Specific embodiment
Below with reference to drawings and the specific embodiments, technical solution of the present invention is described in detail.
The flow control method of flexible direct current power grid of the invention, is applied on flexible direct current power grid, the flexible direct current
Power grid includes converter station and a plurality of DC line for realizing each converter station reticular structure interconnection, and the DC line includes just
Pole, anode circuit, the converter station include positive inverter and cathode inverter, and the anode inverter and cathode inverter are adopted
Being connected with the very bipolar mode of connection with corresponding DC line, being transported when there is asymmetry in the DC line for connecting this converter station
When row line, anode, the anode circuit current-symmetrical of DC line of the control in symmetrical operation state, including following two tune
Section mode,
(A) by adjust converter station bus voltage, realize control in symmetrical operation state DC line anode,
Anode circuit current-symmetrical；
(B), there are when commutator transformer or DC power flow controller, passing through commutator transformer or direct current on DC line
Flow controller adjusts the electric current of corresponding DC line, realizes the positive, negative of DC line of the control in symmetrical operation state
Polar curve road current-symmetrical；
Anode, the anode circuit current-symmetrical of the DC line refer to that anode, anode circuit current direction are identical, size
In control error range, it is 1% that control error range, which more preferably may be selected,.
The DC line symmetrical operation is in connected state together or is in off-state together for anode, anode circuit, no
Then, which is asymmetric operation；The connected state be DC line two sides breaker or every knife be coincidence, institute
State the breaker or there are quartiles every knife that off-state is DC line two sides.
Below according to the flow control method of flexible direct current power grid of the invention, a specific embodiment is introduced, such as Fig. 2 institute
Show, the connection schematic diagram at embodiment a flexible direct current line commutation station and other converter stations, each converter station passes through n (n >=1) item
DC line is connect with other converter stations, and the i-th (1≤i≤n) DC line includes anode route Li_P and anode circuit Li_
N, converter station include anode inverter P1 and cathode inverter P2 and use the very bipolar mode of connection and corresponding DC line phase
Connection, the pole bus current of positive inverter P1 are Idp, and the electric current for connecting the n DC line of positive inverter P1 is respectively
IdpL1…IdpLn；The pole bus current of cathode inverter P2 is Idn, connects the electricity of the n DC line of positive inverter P2
Stream is respectively IdnL1 ... IdnLn.
For i-th DC line, when anode, anode circuit are in connection together or are in off-state together, at the route
It is otherwise asymmetric operation state in symmetrical operation state.By taking the 1st article of DC line as an example, when dc circuit breaker DCB11,
When DCBx1 is coincidence, the positive route L1_P of the 1st article of DC line is in connected state；When dc circuit breaker DCB11 is quartile
Or dc circuit breaker DCBx1 be quartile when, the positive route L1_P of the 1st article of DC line is in an off state；Work as direct current interruption
When device DCB12, DCBx2 are coincidence, the anode circuit L1_N of the 1st article of DC line is in connected state；Work as dc circuit breaker
When DCB12 is quartile or dc circuit breaker DCBx2 is quartile, the anode circuit L1_N of the 1st article of DC line is in an off state.
When the positive route L1_P and anode circuit L1_N of 1st article of DC line are connected state, the 1st article of DC line is symmetrically transported
Row；When the positive route L1_P and anode circuit L1_N of 1st article of DC line are off-state, the 1st article of DC line is also
Symmetrical operation；Remaining situation be asymmetric operating, the flow control method of flexible direct current power grid, as shown in Fig. 2,
Step 201: connecting the DC line of this converter station, there are asymmetric operations, enter step 202, otherwise enter step
201；
Step 202: to the route of connection all symmetrical operations of this converter station, its anode, anode circuit current-symmetrical is controlled,
Enter step 201.
It is further illustrated in conjunction with Fig. 1, S is the line in symmetrical operation state in the DC line of positive inverter P1 connection
The set of road serial number connects any one the route j ∈ S of positive inverter P1, controls its anode, anode circuit electric current pair
Referred to as:
IdpLj=IdnLj
Wherein, IdpLjFor the positive line current of the symmetrical operation DC line j of the positive inverter P1 of connection；IdnLjFor even
Connect the anode circuit electric current of the symmetrical operation DC line j of cathode inverter P2；It is positive, anode circuit current-symmetrical to control it
Method particularly includes: the voltage by adjusting converter station bus makes the current-symmetrical of positive route and anode circuit；More preferably, when straight
When commutator transformer or DC power flow controller are installed on Flow Line, adjusted by commutator transformer or DC power flow controller
Electric current on the DC line, two ways can be realized the anode of the DC line in symmetrical operation state, negative line
Road current-symmetrical.The flow control method of flexible direct current power grid of the invention occurs monopole disconnection fault in DC grid and draws
When playing route asymmetric operation, purposefully remaining route positive and negative electrode Line Flow can be controlled, avoid All other routes
There is Overload, effectively improves the runnability of DC grid, and can guarantee the converter station that disconnection fault does not occur
Earth current it is smaller, have a good application prospect.
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 (2)
1. a kind of flow control method of flexible direct current power grid, is applied on flexible direct current power grid, the flexible direct current power grid packet
It includes converter station and realizes that a plurality of DC line of each converter station reticular structure interconnection, the DC line include positive, negative
Polar curve road, the converter station include positive inverter and cathode inverter, it is characterised in that: the anode inverter and cathode change
Stream device is connected using the very bipolar mode of connection with corresponding DC line, when in the DC line for connecting this converter station in the presence of not
When symmetrical operation route, anode, the anode circuit current-symmetrical of DC line of the control in symmetrical operation state, including it is following
Two kinds of regulative modes,
(A) by adjusting the voltage of converter station bus, anode, the cathode of DC line of the control in symmetrical operation state are realized
Line current is symmetrical；
(B), there are when commutator transformer or DC power flow controller, passing through commutator transformer or DC power flow on DC line
Controller adjusts anode, the anode circuit electric current of the DC line in symmetrical operation state, realizes that control is in symmetrical operation
Anode, the anode circuit current-symmetrical of the DC line of state；
The DC line in symmetrical operation state is in connected state together or is in disconnection together for anode, anode circuit
The DC circuit of state；
DC line in asymmetric operation state is DC circuit positive, that anode circuit is in different on off operating modes.
2. the flow control method of flexible direct current power grid according to claim 1, it is characterised in that: the DC line pair
Title operates to anode, anode circuit is in connected state together or is in off-state together, and otherwise, which is asymmetric fortune
Row；The connected state is the breaker of DC line two sides or is coincidence every knife, and the off-state is DC line two
The breaker of side or there are quartiles every knife.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610921094.5A CN106451519B (en) | 2016-10-21 | 2016-10-21 | A kind of flow control method of flexible direct current power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610921094.5A CN106451519B (en) | 2016-10-21 | 2016-10-21 | A kind of flow control method of flexible direct current power grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106451519A CN106451519A (en) | 2017-02-22 |
| CN106451519B true CN106451519B (en) | 2019-01-04 |
Family
ID=58175833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610921094.5A Active CN106451519B (en) | 2016-10-21 | 2016-10-21 | A kind of flow control method of flexible direct current power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106451519B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467777B (en) * | 2020-11-16 | 2022-06-21 | 国网浙江省电力有限公司电力科学研究院 | Method for controlling asymmetric direct current by using modular combined direct current transformer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872695A (en) * | 2014-03-14 | 2014-06-18 | 中国能源建设集团广东省电力设计研究院 | Flexible direct current converter station valve hall-direct current field combined building structure |
| US20150035371A1 (en) * | 2013-07-31 | 2015-02-05 | Shehab Ahmed | Apparatus and method for voltage and current balancing in generation of output power in power generation systems |
| CN104362661A (en) * | 2014-11-10 | 2015-02-18 | 国家电网公司 | Flexible DC transmission bipolar main junction device |
| CN105406500A (en) * | 2015-12-18 | 2016-03-16 | 华中科技大学 | Asymmetric operational control method of direct current side monopolar grounding fault of MMC-HVDC system |
| CN105977954A (en) * | 2016-05-16 | 2016-09-28 | 国家电网公司 | Circuit breaker hybrid configuration method and device for flexible DC power grid |
-
2016
- 2016-10-21 CN CN201610921094.5A patent/CN106451519B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150035371A1 (en) * | 2013-07-31 | 2015-02-05 | Shehab Ahmed | Apparatus and method for voltage and current balancing in generation of output power in power generation systems |
| CN103872695A (en) * | 2014-03-14 | 2014-06-18 | 中国能源建设集团广东省电力设计研究院 | Flexible direct current converter station valve hall-direct current field combined building structure |
| CN104362661A (en) * | 2014-11-10 | 2015-02-18 | 国家电网公司 | Flexible DC transmission bipolar main junction device |
| CN105406500A (en) * | 2015-12-18 | 2016-03-16 | 华中科技大学 | Asymmetric operational control method of direct current side monopolar grounding fault of MMC-HVDC system |
| CN105977954A (en) * | 2016-05-16 | 2016-09-28 | 国家电网公司 | Circuit breaker hybrid configuration method and device for flexible DC power grid |
Non-Patent Citations (1)
| Title |
|---|
| 交直流混合系统中考虑安全约束的VSC-HVDC功率最优设置;叶荣等;《电网技术》;20160930;第40卷(第9期);第2668-2674页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106451519A (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108847680B (en) | Alternating current-direct current hybrid power distribution network layered control method based on flexible ring network device | |
| Liu et al. | VSCs-HVDC may improve the Electrical Grid Architecture in future world | |
| CN103107551B (en) | Topology circuit used for offshore wind power electric energy delivery | |
| CN104113280A (en) | Serial-connection-type photovoltaic square matrix | |
| CN103001254A (en) | Alternating current and direct current hybrid micro-grid system | |
| CN115579969A (en) | Energy router topological structure based on flexible interconnection and control method thereof | |
| CN110365036B (en) | Power coordination control method and device for LCC-VSC direct current transmission system | |
| CN110137977B (en) | Converter station series connection adjusting system and control method | |
| CN106451519B (en) | A kind of flow control method of flexible direct current power grid | |
| CN102857142A (en) | Multi-path MPPT (maximum power point tracking) circuit and solar photovoltaic inverter | |
| CN107204624B (en) | Power transmission system suitable for global energy Internet and control method thereof | |
| CN106712272A (en) | Uninterrupted power source system | |
| CN110365037B (en) | Power coordination control method and device for LCC-VSC direct current transmission system | |
| CN205304269U (en) | Direct current pressure increasing system of grid -connected PV electricity generation | |
| CN102290405A (en) | Thyristor press mounting structure for modular multi-electrical-level voltage source current converter | |
| CN106356882B (en) | A kind of flow control method for flexible direct current power grid | |
| CN204103855U (en) | Tandem photovoltaic square formation | |
| CN113572189B (en) | Bipolar flexible direct current system for offshore wind power and transformer fault switching method thereof | |
| CN105656082A (en) | Voltage stabilization control structure for photovoltaic cell panel set | |
| CN205407286U (en) | Cluster voltage stabilization controlling means of photovoltaic cell board group | |
| CN111277002B (en) | Flexible excitation power unit parallel topology structure and control method thereof | |
| CN102270925A (en) | Insulation coordinating method of module unit of modularized multi-level voltage source converter | |
| CN112653347A (en) | Power router topology based on direct current integration mode and control method thereof | |
| CN105576969A (en) | LCL resonance type main circuit used for direct current power grid modularization | |
| CN106356881B (en) | A kind of flexible direct current power transmission system and its fault recovery method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180611 Address after: 211102 19 integrity Avenue, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Applicant after: NARI Group Co. Ltd. Applicant after: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant after: Nanjing Nari-Relays Engineering Technology Co., Ltd. Address before: 211102 Suyuan Avenue, Jiangning District, Nanjing, Jiangsu Province, No. 69 Applicant before: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant before: Nanjing Nari-Relays Engineering Technology Co., Ltd. |
|
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20181029 Address after: 211102 19 integrity Avenue, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Applicant after: NARI Group Co. Ltd. Applicant after: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant after: Nanjing Nari-Relays Engineering Technology Co., Ltd. Applicant after: State Grid Corporation of China Applicant after: National Institute of economic and technology research, Jiangsu Electric Power Co., Ltd. Address before: 211102 19 integrity Avenue, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Applicant before: NARI Group Co. Ltd. Applicant before: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant before: Nanjing Nari-Relays Engineering Technology Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |