CN106356882A - Power flow control method used for flexible DC grid - Google Patents
Power flow control method used for flexible DC grid Download PDFInfo
- Publication number
- CN106356882A CN106356882A CN201610917185.1A CN201610917185A CN106356882A CN 106356882 A CN106356882 A CN 106356882A CN 201610917185 A CN201610917185 A CN 201610917185A CN 106356882 A CN106356882 A CN 106356882A
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- line
- inverter
- positive pole
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- negative pole
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
-
- 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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- Direct Current Feeding And Distribution (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention discloses a power flow control method used for a flexible DC grid, comprising the following steps: A) monitoring in time whether asymmetrically operating DC lines exist in all the DC lines connected with an existing converter station, if so, then executing step B); B) executing step C) when the asymmetrically operating DC lines connected with a positive current converter are disconnection lines, otherwise, entering step D); C) controlling a pole busbar current of the positive current converter to be the sum of the currents of all the symmetrically operating DC lines connected with a negative current converter corresponding to the positive current converter; and executing step A); D) executing step E) when asymmetrically operating DC lines connected with the negative current converter are disconnection lines; and E) controlling a pole busbar current of the negative current converter to be the sum of the currents of all the symmetrically operating DC lines connected with a positive current converter corresponding to the negative current converter. By adopting the power flow control method, other DC lines can be prevented from being overloaded, operating performance of flexible DC grids is effectively improved and a favorable application prospect is achieved.
Description
Technical field
The present invention relates to Power System Flexible technical field of direct current power transmission and in particular to a kind of for flexible direct current electrical network
Flow control method.
Background technology
A few days ago, the increasingly depleted with fossil energy and the increasingly increase improving ambient pressure, China or even the equal face in the world
Face the strategical adjustment of energy resource structure, large-scale development and imperative using new forms of energy.In order to adapt to future source of energy general layout
Profound change, the new utilization ratio to improve generation of electricity by new energy for the research and development collecting technology of sending and dissolve need to be accelerated.In recent years
Come, scholars examine electrical network transmission ＆ distribution power technology again closely, and DC techniques become study hotspot again, the concept such as flexible direct current electrical network should
Transport and give birth to.Flexible DC power transmission, is to adopt voltage source converter, can independently, quick control control active power and idle
Power, thus improving the stability of flexible direct current power transmission system, the fluctuation of suppression flexible direct current power transmission system frequency and voltage, carry
The steady-state behaviour of high grid-connected power generation system synchronization AC.
Flexible direct current electrical network is a flexible direct current power transmission system with " mesh ", has a plurality of AC line between current conversion station
Road is connected by dc circuit breaker, and whole flexible direct current power transmission system has redundancy, and in electricity transmission process, DC line adopts frame
The probability breaking down during ceases to be busy is higher, when a DC line breaks down, in fact it could happen that other are straight during protection open-circuit line
The situation of the positive and negative electrode asymmetric operation of Flow Line, at this time, it may be necessary to take suitably strategy to avoid causing other DC lines to go out
The problems such as existing overload.
Content of the invention
The purpose of the present invention is to overcome existing flexible direct current electrical network, and when a DC line breaks down, protection disconnects
In fact it could happen that the situation of the positive and negative electrode asymmetric operation of other DC lines during circuit, other DC lines are caused to occur bearing
The problem of lotus.The flow control method for flexible direct current electrical network of the present invention, one pole broken string in flexible direct current electrical network
When fault causes DC line asymmetric operation, can purposefully the positive and negative electrode Line Flow of remaining DC line be carried out
Control, it is to avoid Overload in other DC lines, effectively improve the runnability of flexible direct current electrical network, have good
Application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of flow control method for flexible direct current electrical network, applies on flexible direct current electrical network, described flexible direct current
Electrical network includes multiple current conversion stations, and each current conversion station realizes network structure interconnection by a plurality of DC line, and described DC line is equal
Including positive pole, negative pole circuit it is characterised in that: each current conversion station all includes positive pole inverter and negative pole inverter, and described positive pole changes
Stream device is all connected with corresponding DC line using the very bipolar mode of connection with negative pole inverter, described flexible direct current electrical network
Flow control method, comprises the following steps,
Step (a), real-time monitoring connects and whether there is asymmetric operation AC line in all DC lines of this current conversion station
Road, if existing, execution step (b), otherwise, continues monitoring；
Step (b), when the asymmetric operation DC line that positive pole inverter connects is broken string circuit, then execution step
C (), otherwise, enters step (d)；
Step (c), the pole bus current controlling positive pole inverter is to be connected to the corresponding negative pole change of current of this positive pole inverter
The electric current of all symmetrical operation DC lines of device and, and execution step (a)；
Step (d), when the asymmetric operation DC line that negative pole inverter connects is broken string circuit, then execution step
E (), otherwise, enters step (a)；
Step (e), the pole bus current controlling negative pole inverter is to be connected to the corresponding positive pole change of current of this negative pole inverter
The electric current of all symmetrical operation DC lines of device and, and execution step (a).
A kind of aforesaid flow control method for flexible direct current electrical network it is characterised in that: connect the institute of this current conversion station
DC line symmetrical operation is had to be each DC line positive pole, negative pole circuit is in connected state or off-state together, otherwise for even
There is asymmetric operation DC line in all DC lines connecing this current conversion station.
A kind of aforesaid flow control method for flexible direct current electrical network it is characterised in that: described connected state be should
The dc circuit breaker at DC line both ends or every knife be conjunction position, described off-state is the direct current at this DC line both ends
Chopper or be a point position every knife.
The invention has the beneficial effects as follows: the flow control method for flexible direct current electrical network of the present invention, in flexible direct current
When one pole disconnection fault occurring in electrical network causing DC line asymmetric operation, can be purposefully to remaining DC line
Positive and negative electrode Line Flow is controlled, it is to avoid Overload in other DC lines, effectively improves flexible direct current electrical network
Runnability, has a good application prospect.
Brief description
Fig. 1 is the system block diagram of flexible direct current electrical network one embodiment of the present invention.
Fig. 2 is the flow chart of the flow control method of flexible direct current electrical network one embodiment of the present invention.
Specific embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
The flow control method for flexible direct current electrical network of the present invention, applies on flexible direct current electrical network, flexible direct current
Electrical network includes multiple current conversion stations, and each current conversion station realizes network structure interconnection by a plurality of DC line, and DC line all includes
Positive pole, negative pole circuit, each current conversion station all includes positive pole inverter and negative pole inverter, and positive pole inverter and negative pole inverter are all adopted
It is connected with corresponding DC line with the very bipolar mode of connection, the flow control method of flexible direct current electrical network, walk including following
Suddenly,
Step (a), real-time monitoring connects and whether there is asymmetric operation AC line in all DC lines of this current conversion station
Road, if existing, execution step (b), otherwise, continues monitoring；
Step (b), when the asymmetric operation DC line that positive pole inverter connects is broken string circuit, then execution step
C (), otherwise, enters step (d)；
Step (c), the pole bus current controlling positive pole inverter is to be connected to the corresponding negative pole change of current of this positive pole inverter
The electric current of all symmetrical operation DC lines of device and, and execution step (a)；
Step (d), when the asymmetric operation DC line that negative pole inverter connects is broken string circuit, then execution step
E (), otherwise, enters step (a)；
Step (e), the pole bus current controlling negative pole inverter is to be connected to the corresponding positive pole change of current of this negative pole inverter
The electric current of all symmetrical operation DC lines of device and, and execution step (a).
Wherein, all DC line symmetrical operations connecting this current conversion station are each DC line positive pole, negative pole circuit exists together
In connected state or off-state, otherwise there is asymmetric operation DC line in all DC lines for connecting this current conversion station,
Described connected state is the dc circuit breaker at this DC line both ends or is conjunction position every knife, described off-state is this direct current
The dc circuit breaker at circuit both ends or be a point position every knife.
Below according to the present invention for the flow control method of flexible direct current electrical network, introduce a specific embodiment, such as Fig. 1
Shown, the system block diagram of flexible direct current electrical network, each current conversion station is connected with other current conversion stations by n (n >=1) bar DC line,
I-th (1≤i≤n) bar DC line comprises positive pole circuit li_p and negative pole circuit li_n, current conversion station include positive pole inverter p1 and
Negative pole inverter p2, all using the very bipolar mode of connection, the pole bus current of positive pole inverter p1 is idp, connects the positive pole change of current
The electric current of the n bar DC line of device p1 is respectively idpl1 ... idpln；The pole bus current of negative pole inverter p2 is idn, connects
The electric current of the n bar DC line of positive pole inverter p2 is respectively idnl1 ... idnln.
For i-th DC line, when positive pole, negative pole circuit are in connection together or are in off-state together, at this circuit
In symmetrical operation state, otherwise for asymmetric operation state；Taking the 1st article of DC line as a example, when dc circuit breaker dcb11,
When dcbx1 is to close position, the positive pole circuit l1_p of the 1st article of DC line is in connected state；When dc circuit breaker dcb11 is a point position
Or dc circuit breaker dcbx1 is when being point position, the positive pole circuit l1_p of the 1st article of DC line is off；Work as direct current interruption
When device dcb12, dcbx2 are to close position, the negative pole circuit l1_n of the 1st article of DC line is in connected state；Work as dc circuit breaker
When dcb12 is to divide position or dc circuit breaker dcbx2 for dividing position, the negative pole circuit l1_n of the 1st article of DC line is off.
Article 1, when the positive pole circuit l1_p and negative pole circuit l1_n of DC line is connected state, the 1st article of DC line is symmetrically transported
OK；Article 1, when the positive pole circuit l1_p and negative pole circuit l1_n of DC line is off-state, the 1st article of DC line is also
Symmetrical operation；Remaining situation is asymmetric operation.
The flow control method of above-described embodiment flexible direct current electrical network, as shown in Fig. 2 comprising the following steps,
Step 101: real-time monitoring connects when there is asymmetric operation circuit in the DC line of this current conversion station, enters step
102, otherwise, continue real-time monitoring；
Step 102: when the asymmetric operation DC line that positive pole inverter connects is broken string circuit, enter step
103, otherwise, enter step 104；
Step 103: the pole bus current controlling positive pole inverter is to be connected to the corresponding negative pole change of current of this positive pole inverter
The electric current of all symmetrical operation DC lines of device and entrance step 101；
Further illustrate in conjunction with Fig. 1, s is the line being in symmetrical operation state in the DC line connect negative pole inverter p2
The set of road sequence number, the pole bus current idp of control positive pole inverter p1 is:
The pole bus current idp of above-mentioned positive pole inverter p1 and all symmetrical operation AC line connecting negative pole inverter p2
The electric current ldnlj on road is with direction as shown as positive direction；
Step 104: the pole bus current controlling positive pole inverter is to be connected to the corresponding negative pole change of current of this positive pole inverter
The electric current of all symmetrical operation DC lines of device and, enter step 105, otherwise, enter step 101；
Step 105: the pole bus current controlling negative pole inverter is to connect this negative pole inverter corresponding positive pole inverter
The electric current of all symmetrical operation DC lines and, enter step 101.
Further illustrate in conjunction with Fig. 1, t is the line being in symmetrical operation state in the DC line that positive pole inverter p1 connects
The set of road sequence number, the pole bus current idn of control negative pole inverter p2 is:
The pole bus current idn of above-mentioned negative pole inverter p2 and all symmetrical operation AC line connecting positive pole inverter p1
The electric current ldplj on road is with direction as shown as positive direction.
In sum, the flow control method for flexible direct current electrical network of the present invention, occurs in flexible direct current electrical network
When one pole disconnection fault causes DC line asymmetric operation, positive and negative electrode circuit that can purposefully to remaining DC line
Trend is controlled, it is to avoid Overload in other DC lines, effectively improves the runnability of flexible direct current electrical network, tool
There is good application prospect.
Ultimate principle, principal character and the advantage of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not restricted to the described embodiments, the simply explanation present invention's described in above-described embodiment and description is former
Reason, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements
Both fall within scope of the claimed invention.Claimed scope is by appending claims and its equivalent circle.
Fixed.
Claims (3)
1. a kind of flow control method for flexible direct current electrical network, applies on flexible direct current electrical network, described flexible direct current electricity
Net includes multiple current conversion stations, and each current conversion station realizes network structure interconnection by a plurality of DC line, and described DC line all wraps
Include positive pole, negative pole circuit it is characterised in that: each current conversion station all includes positive pole inverter and negative pole inverter, the described positive pole change of current
Device is all connected with corresponding DC line using the very bipolar mode of connection with negative pole inverter, described flexible direct current electrical network
Flow control method, comprises the following steps,
Step (a), real-time monitoring connects in all DC lines of this current conversion station and whether there is asymmetric operation DC line, if
Exist, then execution step (b), otherwise, continue monitoring；
Step (b), when the asymmetric operation DC line that positive pole inverter connects is broken string circuit, then execution step (c), no
Then, enter step (d)；
Step (c), the pole bus current controlling positive pole inverter is to be connected to this positive pole inverter corresponding negative pole inverter
The electric current of all symmetrical operation DC lines and, and execution step (a)；
Step (d), when the asymmetric operation DC line that negative pole inverter connects is broken string circuit, then execution step (e), no
Then, enter step (a)；
Step (e), the pole bus current controlling negative pole inverter is to be connected to this negative pole inverter corresponding positive pole inverter
The electric current of all symmetrical operation DC lines and, and execution step (a).
2. a kind of flow control method for flexible direct current electrical network according to claim 1 it is characterised in that: connect this
All DC line symmetrical operations of current conversion station are each DC line positive pole, negative pole circuit is in connected state together or disconnect shape
State, otherwise all DC lines for connecting this current conversion station there is asymmetric operation DC line.
3. a kind of flow control method for flexible direct current electrical network according to claim 1 it is characterised in that: described company
Logical state is the dc circuit breaker at this DC line both ends or is conjunction position every knife, described off-state is this DC line two
The dc circuit breaker of end or be a point position every knife.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610917185.1A CN106356882B (en) | 2016-10-21 | 2016-10-21 | A kind of flow control method for flexible direct current power grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610917185.1A CN106356882B (en) | 2016-10-21 | 2016-10-21 | A kind of flow control method for flexible direct current power grid |
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| CN106356882A true CN106356882A (en) | 2017-01-25 |
| CN106356882B CN106356882B (en) | 2018-07-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521136A (en) * | 2018-04-24 | 2018-09-11 | 东南大学 | A kind of multiple target cooperative control method based on true bipolar flexible direct current transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108521136A (en) * | 2018-04-24 | 2018-09-11 | 东南大学 | A kind of multiple target cooperative control method based on true bipolar flexible direct current transmission system |
| CN108521136B (en) * | 2018-04-24 | 2019-06-28 | 东南大学 | A kind of multiple target cooperative control method based on true bipolar flexible direct current transmission system |
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| Publication number | Publication date |
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| CN106356882B (en) | 2018-07-20 |
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| CB03 | Change of inventor or designer information |
Inventor after: Wang Nannan Inventor after: Tian Shuran Inventor after: Liu Bin Inventor after: Kang Kai Inventor after: Lu Yu Inventor after: Dong Yunlong Inventor after: Jiang Chongxue Inventor after: Hu Zhaoqing Inventor after: Wang Ke Inventor after: Hu Xianlai Inventor after: Li Gang Inventor after: Sui Shunke Inventor before: Wang Nannan Inventor before: Lu Yu Inventor before: Dong Yunlong Inventor before: Jiang Chongxue Inventor before: Hu Zhaoqing Inventor before: Wang Ke Inventor before: Hu Xianlai Inventor before: Li Gang Inventor before: Sui Shunke |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170804 Address after: 211102 Jiangning, Jiangsu, Jiangsu Province, the source of the road No. 69 Applicant after: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant after: Nanjing Nari-Relays Engineering Technology Co., Ltd. Applicant after: Yantai Power Supply Company, State Grid Shandong Electric Power Company Applicant after: State Grid Corporation of China Address before: 211102 Jiangning, Jiangsu, Jiangsu Province, the source of the road No. 69 Applicant before: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant before: Nanjing Nari-Relays Engineering Technology Co., Ltd. |
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